Sand-grain-sized drum extends reach of quantum theory

The banging of a tiny drum heralds the intrusion of the weird world of quantum mechanics into our everyday experience. Though no bigger than a grain of sand, the drum is the largest object ever to have been caught obeying the uncertainty principle, a central idea in quantum theory.

As well as extending the observed reach of quantum theory, the finding could complicate the hunt for elusive gravitational waves : it suggests that the infinitesimal motion caused by these still-hypothetical ripples in spacetime could be overwhelmed by quantum effects.

The uncertainty principle says that you cannot simultaneously determine both a particle's exact position and momentum. For example, bouncing a photon off an electron will tell you where it is, but it will also change the electron's motion, creating fresh uncertainty in its speed.

This idea limits our ability to measure the properties of very small objects, such as electrons and atoms. The principle should also apply to everyday, macroscopic objects, but this has not been tested – for larger objects, the principle's effects tend to be swamped by other uncertainties in measurement, due to random noise, say.

Quantum drum

To extend the known reach of the uncertainty principle, Tom Purdy and colleagues of the University of Colorado, Boulder, created a drum by tightly stretching a 40-nanometre-thick sheet of silicon nitride over a square frame with sides of half a millimetre – about the width of a grain of sand. They placed the drum inside a vacuum chamber cooled to a few degrees above absolute zero, minimising any interference by random noise.

By continuously firing a stream of photons at the drum they were able to get increasingly precise measurements of the position of the skin at any moment. However, this also caused the skin to vibrate at an unknown speed. When they attempted to determine its momentum, the error in their measurement had increased – just as the uncertainty principle predicts.

"You don't usually have to think about quantum mechanics for objects you can hold in your hand," says Purdy.

That the uncertainty principle holds sway at such a large scale could affect the hunt for gravitational waves, which are predicted by Einstein's theory of general relativity but have never been detected.

Mitigation strategy

Gravitational wave detectors look for very slight changes in the distance between two test masses caused by passing spacetime ripples. Purdy says his team's experiment confirms long-held suspicions that quantum uncertainty could overwhelm these very small changes.

Now he and others can use the drum to explore more advanced measurement techniques to mitigate the effects. For example, uncertainty in an object's momentum could lead to future uncertainty in its position and there should be ways to minimise such knock-on effects. "You can't avoid the uncertainty principle, but you can in some clever ways make it [such that] increasing the momentum doesn't add back to the uncertainty in position at a later time," says Purdy.

His experiment is a neat demonstration of the breakdown of the traditional notion that the atomic world is quantum while the macroscopic world is classic, says Gerard Milburn of the University of Queensland in Brisbane, Australia, who was not involved in the work. Previous, attempts to blur the quantum-classical divide have involved entangling diamonds and demonstrating quantum superposition in a strip of metal.

Despite these feats, Milburn doesn't rule out the prospect of a breakdown on really large scales. "Of course maybe one day we will see quantum mechanics fail at some scale. Testing it to destruction is a good motivation for going down this path," he says.

Journal reference: Science, DOI: 10.1126/science.1231282

If you would like to reuse any content from New Scientist, either in print or online, please contact the syndication department first for permission. New Scientist does not own rights to photos, but there are a variety of licensing options available for use of articles and graphics we own the copyright to.

All comments should respect the New Scientist House Rules. If you think a particular comment breaks these rules then please use the "Report" link in that comment to report it to us.

If you are having a technical problem posting a comment, please contact technical support.

Read More..

Obama says public deserves to know more on drones

WASHINGTON: President Barack Obama said Thursday that Americans needed more than just his word to be assured he was not misusing his powers in waging a secret drone war overseas.

The president was asked about the debate over the deadly tactic, a backbone of the US campaign against Al-Qaeda, and whether the Constitution allows the use of drones against Americans who have turned against their country.

"It is not sufficient for citizens to just take my word for it that we are doing the right thing," Obama told an online forum sponsored by Google.

The president, who has said he is working with Congress to provide more oversight of the clandestine drone war against Al-Qaeda, was also asked what was to stop the US government from using unmanned aerial vehicles at home.

"There has never been a drone used on an American citizen on American soil," Obama said in the Google Plus "Fireside Hangout."

"The rules outside the United States are going to be different than the rules inside of the United States in part because our capacity, for example, to capture terrorists in the United States is going to be very different than in the foothills or mountains of Afghanistan or Pakistan.

Debate about the use of drones has slowly been mounting following the September 2011 killing in Yemen of cleric Anwar al-Awlaki, a senior Al-Qaeda operative who was an American citizen.

The president said that he was working with Congress to ensure that the public was also able to understand the constraints and legal rationales of the US drone war.

"I am not somebody who believes that the president has the authority to do whatever he wants, or whatever she wants, whenever they want, just under the guise of counter terrorism," he added.

"There have to be checks and balances on it."

Some observers, including prominent senators, are considering whether a special court should monitor the secret drone war.

Missiles fired from unmanned aircraft have become the Obama administration's weapons of choice in its war against Al-Qaeda.

The administration's legal rationale for the targeted killings was leaked to the media ahead of Senate hearings last week on the nomination of Obama's top counterterrorism adviser John Brennan to head the CIA.

The guidelines allow the use of drone strikes against US citizens suspected of being senior Al-Qaeda operatives, even if there is no evidence they are actively plotting an attack.

Some administration critics have questioned the legality of drone strikes against US citizens, while others fear that raining death from the skies may do more harm than good in increasing anti-US sentiment.

- AFP/jc

Read More..

Mom of boy held in bunker is worried

STORY HIGHLIGHTS

• Phil McGraw speaks with mother of former Alabama child hostage


• She tells him she worried about trying to put him back on a school bus


• Ethan told her the Army killed the 'bad man'


• The 6-year-old tells his mom that 'My bus driver is dead'

(CNN) -- Jennifer Kirkland says she caught her 6-year-old son Ethan just staring at a school bus the other day.

He was mesmerized, his eyes locked on the yellow vehicle. He didn't say a thing, and she didn't know what to say to him.

The last time he was on a bus, he was sitting just behind the driver -- as he always did -- waiting for his stop so he could go home.

But the "bad man" got on, and killed the driver, his buddy Mr. Poland.

Appearing on the "Dr. Phil" show, Kirkland told Phil McGraw she was worried how her little boy was going to react the next time she tried to put him on the bus to school.

After being kidnapped, the recovery ahead

Photos: Alabama bunker standoff

HIDE CAPTION

Ethan has been having a hard time sleeping, she told the psychologist turned syndicated daytime talk show host.

He thrashes his arms, tosses and turns and sometimes he calls out.

It has only been almost 10 days since the FBI sent a rescue team into the bunker in Midland City, Alabama, where Ethan was held hostage for nearly a week by Jimmy Lee Dykes.

His mother hasn't asked Ethan what happened when he was there.

"I have not talked to Ethan about it," she said in an interview aired Wednesday. "I don't know how to. As a mother I want him to know that I'm there if he needs to talk. I don't know how to respond because I have never been through this."

Inside the bunker: From storm shelter to boy's prison

Ethan has seen two people shot to death. Dykes shot bus driver Charles Poland several times before he carried Ethan, who had fainted, off the bus and into an underground bunker Dykes had built on his property.

Then the FBI killed Dykes when negotiations broke down and authorities felt they had to rescue the boy before Dykes, who had a handgun, did something rash.

"The Army came in and shot the bad man," Kirkland said Ethan told her.

Kirkland said she had hoped Dykes wouldn't be harmed.

"From the very beginning, I had already forgiven Mr. Dykes even though he had my child," she said. "I could not be angry through this. My job was to be the mother."

She thinks Dykes had a soft spot for Ethan because he has disabilities. Dykes took care of her boy as best he could, she said.

He even fried chicken for the boy.

Still, as the crisis continued, she worried that Dykes might be spooked by something her child did -- or that he had enough supplies to stay down there for months. She worried her boy would think she had abandoned him.

She asked authorities to let her speak to Dykes.

"That's my baby. He's my world. He's my everything," she said. "Everything I do I do for him. And I was afraid I wasn't going to get him back."

When she did get him back, he was in the hospital, putting stickers on everyone in sight.

"Hey, bug, I sure have missed you," she recounted.

"I missed you, too," he answered.

FBI: Bombs found in Alabama kidnapper's bunker

Now she worries that even though he seems like the same playful little boy, there is an emotional storm ahead.

McGraw told her to talk to Ethan about his feelings, not what happened to him in the bunker.

"Let that decay in his young mind," he said.

McGraw asked Ethan a few questions, but as 6-year-olds are apt to do, he answered most with a "Yes" or a "No."

But when the doctor asked him how he got to school, Ethan said, "On my bus, but my ..."

Then he walked over to his mother and as if telling a secret, whispered in her ear, "But my bus driver is dead."

Kirkland told McGraw that it was Poland who helped Ethan conquer his fear of descending the steep school bus steps. Poland would cheer Ethan on and one day when the child hesitated and the mother went to help, the driver said, "Let him do it."

Since then, Ethan has had no problem.

But now his cheerleader won't be there, and Kirkland is anguished about her boy.

"Mr. Poland put him behind him so he could keep a good eye on him," she said.

Ethan hasn't been back to school yet. He's been busy opening birthday presents and playing with his favorite toys. On Wednesday, he made a new friend in Gov. Robert Bentley.

There's a picture from the event where little Ethan is sitting underneath the governor's desk. The child is beaming.

"Ethan is a loving, forgiving child," Kirkland said. "He is easy to go up to a perfect stranger and say, 'Can I have a hug?'"

That was the boy who went into that bunker. She is concerned it's not the child who came out.

Read More..

Body in burned cabin ID'd as Christopher Dorner

(CBS News) BIG BEAR LAKE, Calif. - Remains of a man who was in a burned California cabin on Tuesday have been positively identified as belonging to that of Christopher Dorner, the former LAPD officer who was suspected of killing four people and was the subject of an intense manhunt, officials confirmed.

The San Bernardino County Coroner's office said the positive identification was made through dental records.

The final hours of the manhunt for Christopher Dorner began when Jim and Karen Reynolds opened the door of one of their rental condos.

Police fill in the blanks on Dorner's last day
Carjacking victim: Christopher Dorner told me "I don't want to hurt you"
Deputy slain in ex-cop shootout was new father

"We had come into the living room and he opened the door and came out at us," said Karen.

"He had the gun drawn," added Jim.

A man believed to be Dorner tied them up.

"He talked to us, trying to calm us down," said Karen, "and saying very frequently he would not kill us."

He then took their car. "We listened for probably a minute or two, wanted to make sure he was gone," said Jim, "sounded quiet. And then we started struggling trying to get loose."

They called 911, triggering a chain of events that ended with Tuesday's shootout in which two sheriffs deputies were shot. Thirty-five-year-old Jeremiah MacKay died from his wounds.

The firefight that we witnessed was intense and we were forced to take cover - however, we left his cell phone on. Early in the standoff you could hear officers suggesting burning the suspect out.

One officer can be heard saying, "Burn that ------ out , burn it down, ------ burn this mother-----"

Four more hours would pass before police used high-powered tear gas. The canisters are known to be a fire hazard.

"We did not intentionally burn down that cabin to get Mr. Dorner out," San Bernandino Sheriff John McMahon had said.

Dorner's body was found in the ashes. It's unclear if the cause of death was from the fire -- or a single shot we heard moments after the cabin ignited.

Meanwhile, investigators looking through a trash bin in Irvine, California, where the first two victims were killed, recovered Dorner's badge, a police uniform, and a high-capacity ammo magazine.

CBS News asked San Bernardino County Sheriff's Department about the audio we recorded, and they declined to comment.

Read More..

Dorner Confirmed Dead in Autopsy on Cabin Remains

Christopher Dorner, the ex-Los Angeles police officer who declared himself on a killing spree against his former law enforcement colleagues, is dead.

Authorities this evening confirmed that remains found after a fiery standoff at a California mountain cabin Tuesday were, in fact, Dorner's.

"The charred human remains located in the burned out cabin in Seven Oaks have been positively identified to be that of Christopher Dorner," the San Bernardino County Sheriff-Coroner's Office said in a written statement. "During the autopsy, positive identification was made through dental examination."

FULL COVERAGE: Christopher Dorner Manhunt

PHOTOS: Former LAPD Officer Suspected in Shootings

In a 6,000-word "manifesto," Dorner outlined his anger at the Los Angeles Police Department for firing him, and made threats against individuals he believed were responsible for ending his career with the police force five years ago. Dorner was fired after filing what the LAPD determined to be a false report accusing other cops of brutality.

Dorner is suspected of killing four people, including Monica Quan and her fiance, who were found shot to death Feb. 3. Quan was the daughter of former LAPD Capt. Randal Quan, who was mentioned as a target of Dorner's fury in the manifesto.

Christopher Dorner Hostages: 'He Just Wanted to Clear His Name' Watch Video

Christopher Dorner Believed Dead After Shootout With Police Watch Video

Christopher Dorner Believed Dead After Shootout with Police Watch Video

Dorner is also suspected in the shooting death of Riverside, Calif., Police Officer Michael Crain, whose funeral was Wednesday.

San Bernardino Sheriff's Deputy Jeremiah MacKay, 35, a 15-year veteran and the father of two children, was killed in Tuesday's shootout at the cabin.

A second San Bernardino County sheriff's officer had to undergo multiple surgeries after he was wounded in the cabin shootout, and other officers also were wounded in earlier alleged encounters with Dorner.

After Crain's death, police tracked Dorner to the Big Bear Lake area of Southern California, where his burning truck was found in the mountains late last week.

A couple with a cabin in the area were some of the last people to see Dorner before his final encounter with police. Their 911 call to police triggered a chase that concluded with the fiery standoff at the nearby cabin.

The couple, Karen and Jim Reynolds, said at a news conference Wednesday that their ordeal lasted a few minutes but seemed like hours.

The Reynolds believe Dorner, 33, was holed up starting Friday in their unoccupied cabin in Big Bear, Calif., only steps from where police had set up a command center.

"He said four or five times that he didn't have a problem with us, he just wanted to clear his name," Jim Reynolds said. "He said, 'I don't have a problem with you, so I'm not going to hurt you.'"

Dorner tied their arms and put pillowcases over their heads before fleeing in their purple Nissan, the couple said.

Before he fled, the couple said Dorner told them that he had been watching them before he took over their cabin. Dorner told the couple he could tell they were "hard working, good people."

"He had been watching us and saw me shoveling the snow Friday," Jim Reynolds said.

They say they may have left the cabin door unlocked and that could have been the reason Dorner was able to enter undetected.

Dorner remained "calm and meticulous" throughout the harrowing ordeal, the couple said.

The Reynolds walked into their cabin around noon Tuesday when they came face-to-face with Dorner. There was no question in their minds who he was -- the suspected cop killer at the center of one of the largest manhunts in recent memory.

Read More..

Water wars loom as the US runs dry

* Required fields

* First name

* Last name

* Country

* Email address

* Password
Password must contain only letters and numbers, and be at least 8 characters

* Confirm password

Read More..

Zuckerberg owns nearly a third of Facebook: US regulators

SAN FRANCISCO: Mark Zuckerberg's stake in Facebook has climbed to nearly 30 percent since the leading social network made its dismal stock market debut, according to a filing Wednesday with US regulators.

Zuckerberg owns 632.65 million Facebook shares as compared with the slightly more than 500 million he held in September when the stock's sagging price prompted a promise he would not sell any for at least a year.

Zuckerberg sold about 30 million shares when the Menlo Park, California-based social network made its stock market debut in May at an opening price of $38.

Shares slid to a low of $17.55 in September but have regained ground, trading at $28.04 at the close of trading on the Nasdaq exchange on Wednesday.

Securities and Exchange Commission filings show Zuckerberg has been building his stake Facebook, the potential of which he contends is underestimated by the market.

One SEC filing showed that Zuckerberg acquired 18 million Facebook shares in mid-December at a price of zero, indicating they were tied to his compensation as chief of the social network.

-AFP/gn

Read More..

Body is thought to be Dorner, but guards remain in place

STORY HIGHLIGHTS

• NEW: Radio traffic describes use of gas canisters at cabins


• Slain officer's widow thanks mourners: "A lot of people loved Mike"


• Villaraigosa says police have a "reasonable belief" that Dorner died in a mountain standoff


• Authorities have not conclusively identified the body found near Big Bear Lake

Follow the story here and at CNN affiliates KCBS/KCAL, KABC and KTLA. Anderson Cooper 360º devotes the entire hour to the frenzied manhunt, the final shootout, and the people allegedly killed by an ex-LA cop. Watch "9 Days of Terror: The Hunt for Christopher Dorner" Wednesday at 8 p.m. ET on CNN.

Riverside, California (CNN) -- A "sigh of relief." A widow's restrained sobs. The lingering fear of the targets, waiting to hear whether their pursuer had truly been run to ground.

A day after a man suspected to be renegade ex-cop Christopher Dorner died in a blazing mountain cabin, police from around the Los Angeles area and beyond gathered to bury one of their own Wednesday. A squad of bagpipers led Michael Crain's flag-draped casket through a cordon of blue uniforms into a church in Riverside, the Los Angeles suburb where he served 11 years on the force.

The mourners who packed the church included California Gov. Jerry Brown, his Highway Patrol chief and law enforcement from an alphabet soup of agencies around the region.

"I knew that communities would reach out, and I knew a lot of people loved Mike," Regina Crain, the slain officer's widow, told them as she choked back tears. "And I knew that I would have support no matter what. But I really did not realize the sheer scale of this, and how many people are touched by his life. It gives me really great comfort to see that, and I want to thank you all."

Investigators say Crain was shot and killed by Dorner, a fired Los Angeles cop who launched a vendetta against his old department last week. They blame the 33-year-old former Navy officer for the deaths of Crain and a still-unnamed San Bernardino County sheriff's deputy killed in Tuesday's fiery standoff. He is also accused of killing the daughter of a former LAPD captain and her fiance and of shooting three other cops, including Crain's partner. The violence spree began February 3.

Los Angeles Mayor Antonio Villaraigosa said authorities have a "reasonable belief" that the body found in a burned-out cabin in the San Bernardino Mountains late Tuesday is Dorner's. But while the SWAT teams that prowled the city in search of the former Navy officer have stood down, the officers detailed to guard his potential victims remain in place.

"I think we all are breathing a sigh of relief," Villaraigosa said Wednesday. "We do believe that it is the body of Christopher Dorner, but we don't know for a certainty. And until we do, those police officers who were targeted will continue to be protected. That's the least we could do."

'A very trying time' for the LAPD

Authorities say Dorner launched a guerrilla war against the Los Angeles Police Department over what he considered his unfair dismissal in 2009.

It wasn't clear when a formal identification could be made of the charred remains found in the cabin near Big Bear Lake, about 100 miles east of Los Angeles, after a Tuesday shootout with police. Until then, "a lot of apprehension" remains in the ranks of the LAPD, Lt. Andy Neiman said.

"It's been a very trying time over the last couple of weeks for all of those involved and all those families, friends and everybody that has been touched by this incident," he said.

Timeline in manhunt

Meanwhile, questions swirled Wednesday over how the shootout, standoff and fire that led to Dorner's presumed death unfolded.

Investigators began scouring the mountains on Thursday, when investigators found Dorner's scorched pickup. Police, sheriff's deputies and federal agents swarmed into the area, working through a weekend blizzard, but the trail was cold for days.

On Sunday, the San Bernardino County Sheriff's Department said it had scaled back the search. Villaraigosa announced a $1 million reward for information leading to Dorner's arrest and conviction, spurring hundreds of tips.

Then early Tuesday afternoon, California Fish and Wildlife wardens said they spotted Dorner driving a purple Nissan down icy roads near Big Bear Lake. He was driving very close to some school buses, as if using them as cover, said Lt. Patrick Foy. No children were on the buses, Foy said.

'Here comes this guy with a big gun'

The wardens, driving in two different vehicles, chased Dorner, and a gun battle ensued. One of the warden's cars was hit, and Dorner crashed his car and ran, according to authorities. He then carjacked a pickup truck.

Rick Heltebrake, a camp ranger, said he was driving when he saw the crashed purple vehicle -- and then something terrifying.

How authorities identify a burned body

"Here comes this guy with a big gun, and I knew who it was right away," Heltebrake told CNN affiliate KTLA. "He just came out of the snow at me with his gun at my head. He said, 'I don't want to hurt you. Just get out of the car and start walking.' "

Heltebrake said the man let him take his dog and walk away with his hands up.

"Not more than 10 seconds later, I heard a loud round of gunfire," Heltebrake said. "Ten to 20 rounds, maybe. I found out later what that was all about."

Dorner fled to a nearby cabin and got into another shootout, this time with San Bernardino County deputies. He killed one and wounded another, San Bernardino County Sheriff John McMahon told reporters Tuesday evening.

The wounded deputy was in surgery at that time but "should be fine," McMahon said.

Some of the firefight between police and the suspect was captured live on the telephone of a reporter for CNN affiliates KCBS and KCAL. Police in Los Angeles listened live over police scanners broadcast on the Internet, Neiman said.

"It was horrifying to listen to that firefight," he said. "To hear those words, 'officer down,' is the most gut-wrenching experience you can have as a police officer, because you know what that means."

'Maintain your discipline'

A law enforcement source told CNN the cabin caught fire when police tossed smoke devices inside. The cabin was fully ablaze within minutes and burned for hours as authorities waited at a distance.

Devices such as "flash-bang" grenades and tear gas canisters designed to disorient and disable suspects can cause fires, CNN contributor Tom Fuentes, a former FBI assistant director, said Wednesday. But it wasn't clear exactly how the fire started.

Audio from a Los Angeles television station captured the sound of someone early in the standoff shouting, "Burn it down ... burn that goddamn house down. Burn it down." It's not clear who used those words.

But the order to use smoke canisters -- "burners" -- didn't come for another two hours, according to San Bernardino County sheriff's radio traffic.

"Seven burners deployed, and we have a fire," one officer reported at 4:16 p.m. (7:16 p.m. ET).

Five minutes later, a single gunshot was reported from inside the house. A senior officer ordered units around the cabin, "Stand by. Maintain your discipline." About a minute after that, officers reported ammunition exploding inside.

After initially saying that no body had been found, sheriff's investigators finally confirmed overnight that they had found charred human remains in the ashes.

Dorner cheered in some quarters

Dorner had vowed to kill police officers to avenge what he called an unfair termination. He was fired after accusing his training officer of kicking a suspect during a July 2007 arrest -- a complaint the LAPD determined was unfounded.

Talk Back: Does the Dorner case teach us anything about guns?

The department accused him of lying to superiors and to internal affairs investigators and forced him out in January 2009. Dorner challenged his dismissal in court but was unsuccessful.

Dorner was first named a suspect in two shooting deaths on February 3: Monica Quan, the daughter of his police union representative, and her fiance, Keith Lawrence.

Police say he killed Crain and wounded Crain's partner in an ambush on their patrol car Thursday. They say he also wounded an LAPD officer who chased him in the suburban city of Corona, California.

In a manifesto explaining the reasons behind his rampage, Dorner said nothing had changed in the LAPD since its scandals of the 1990s, the Rodney King beating and the Rampart police corruption case. Those allegations have struck a chord with some who say that despite being named as a suspect in four killings, Dorner was seeking justice.

Shadowed by that history, LAPD Chief Charlie Beck announced Saturday that the department would re-examine its proceedings against Dorner. The review is "not to appease a murderer," but "to reassure the public that their police department is transparent and fair in all things we do," he said.

During the manhunt, LAPD officers guarding one of the people named in Dorner's manifesto opened fire on a truck in the Los Angeles suburb of Torrance last Thursday, wounding two women inside. In a television interview over the weekend, Beck called that a "tragic, horrific incident."

CNN's Miguel Marquez, Paul Vercammen, Stan Wilson, Casey Wian, Kathleen Johnston, Alan Duke, Lateef Mungin, Chelsea J. Carter, Michael Martinez, Holly Yan and Michael Pearson contributed to this report.

Read More..

American, US Airways set to clinch merger

(MoneyWatch) American Airlines and US Airways (LCC) are set to announce a merger that would create the world's biggest carrier.

Under the deal, which is expected to be unveiled Thursday if the timeline isn't moved up sooner and there are no last-minute snags, the combined airline would keep the "American" name. It would still require federal approval, although that is virtually ensured. US Air CEO Doug Parker is expected to lead the combined company.

A merger of US Air and American would surpass a 2010 tie-up between United Airlines (UAL) and Continental and a 2008 deal joining Delta (DAL) and Northwest. The merged American would be the largest carrier and sport a market valuation of roughly $10 billion.

Although airlines tout such consolidation as a way to cut costs and expand service amid intense competition, whether industry mergers raise fares is an open question. Many analysts say yes because reduced competition in any business often results in higher prices. One study found that ticket prices went up more than 20 percent between Detroit and Atlanta after Delta bought Northwest. Fares went up more than 30 percent on routes between Chicago and Houston, as well as Newark to San Francisco, after the United-Continental deal.

In seeking to run more efficiently, merging airlines also often cut capacity and eliminate routes. 

Play Video

American close to merger with U.S. Airways

Other analysts are more optimistic about the potential benefits to travelers. They say the three largest U.S. airlines still must compete with discount carriers such as Southwest (LUV), which has flourished for years by offering low-cost flights and no-frills service.

The consolidation trend is largely blamed on the price of fuel. Oil now costs so much more per barrel than it did 10 years ago that one analyst says the margin of profit on many flights has shrunk to the value of a single seat. That means an airline can lose money if it flies with one single empty middle seat. The days of elbow room are over.

American Airlines has been operating under court supervision since declaring bankruptcy in November 2011.

Read More..

Ship Stranded: Love Boat to Horror Honeymoon

A Texas couple's fantasy wedding quickly turned into a nightmare honeymoon when the fire-damaged Carnival Cruise ship carrying them became stranded in the Gulf of Mexico.

Rob Mowlam, 37, and Stephanie Stevenson, 27, of Nederland, Texas, got married on the Carnival Triumph on Saturday. The four-day cruise was meant to be back to shore on Monday, but was left disabled by an engine fire on Sunday.

The ship is being slowly towed to shore and is expected to dock in Mobile, Ala., on Thursday if weather permits. The vessel is without air conditioning, many working toilets and some restaurant service. Passengers, many who are sleeping in tents on deck, have told ABC News the smell on the ship is foul.

That is the honeymoon setting for Mowlam and Stevenson.

"[Rob Mowlam] had been with his girlfriend, or fiance, for a long period of time and they just took the next step," Mowlam's brother James Mowlam III told ABCNews.com. "The captain is the king of the world when they're on the boat and he hitched them up."

James Mowlam said he was shocked when he heard about the stranded boat and the increasingly dire conditions on the ship.

"It is an atrocious scene to be subjected to," he said.

Mowlam said he has not been able to communicate with his brother, but that his father has had sporadic communication with him.

"It would be my guess that this would probably not be on anyone's great list of memorable wedding experiences," Mowlam said with a laugh. "Although, my mom told him that she was hoping they had a memorable wedding and I think this would classify as a memorable wedding experience."

Lt. Cmdr. Paul McConnell/U.S. Coast Guard/AP Photo

Carnival Cruise Ship Making Its Way to Port Watch Video

Carnival Cruise Ship Stranded for Third Day Watch Video

Carnival Cruise Ship Stranded off Yucatan Peninsula Watch Video

The bride's brother, Justin Davis, told ABCNews.com that his sister works for a doctor's office and the cruise was a gift from the doctor to the staff.

Davis has not been able to speak to Stevenson but said that her two young sons are being cared for by her mother. He said his sister is tough and he guesses she's probably not scared.

"She might be a little aggravated at the situation, but I'd say she's [probably] handling it really well," he said.

Others on the ship do not seem to be handling the situation so well.

Elderly and disabled passengers aboard the ship are struggling to cope with the worsening conditions, according to at least one passenger.

"Elderly and handicap are struggling, the smell is gross," passenger Ann Barlow text-messaged ABC News overnight. "Our room is leaking sewage."

The head of Carnival Cruise Lines said the British-U.S.-owned company was working hard to ensure the thousands of passengers stranded on the disabled ship were as comfortable as possible while the vessel was being towed to a port in Alabama.

"I need to apologize to our guests and to our families that have been affected by a very difficult situation," Carnival Cruise Lines president and CEO Gerry Cahill said at a news conference Tuesday evening.

It was the first time since a fire erupted in Triumph's engine room Sunday, knocking out its four engines, that a company representative had spoken publicly. The Triumph, with roughly 4,200 people on board, was left bobbing like a 100,000-ton cork for more than 24 hours. Giant sea-faring tugboats then hooked up to the ship and began towing the nearly 900-foot-long ship to land.

Carnival spokeswoman Joyce Oliva told The Associated Press Tuesday that a passenger with a pre-existing medical condition was taken off the ship as a precaution. Everyone else will likely have to weather conditions such as scarce running water, no air conditioning and long lines for food.

Back on land, passenger Barlow's 11-year-old twins told ABC News Tuesday they are worried as more passengers continue to talk about living with limited power and sanitation.

Read More..