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7 leading theories on disappearance of Flight 370

SCOTT MAYEROWITZ
An office building is illuminated with LED lights displaying "Pray for MH370" next to Malaysia's landmark Petronas Twin Towers in Kuala Lumpur, Malaysia, Wednesday, March 19, 2014. Countless theories have surfaced about the disappearance of Malaysia Airlines Flight 370 nearly two weeks ago. (AP Photo/Lai Seng Sin)

NEW YORK (AP) — Countless theories have surfaced about the disappearance of Malaysia Airlines Flight 370 nearly two weeks ago.

Some are plausible, some are downright absurd. There is, unfortunately, no clear answer as the families of the 239 passengers and crew — and the rest of the world — wait in agony. Even the most logical hypotheses about what happened to the 209-foot-long Boeing 777 have holes. No scenario solves this mystery.

Here is a look at some of the leading, plausible theories — and their flaws.

— MALICIOUS PILOT ACTION

Investigators are looking at the histories of Capt. Zaharie Ahmad Shah, 53, who has been flying for Malaysia Airlines since 1981 and co-pilot Fariq Abdul Hamid, 27, who just started flying a 777. Zaharie had built his own flight simulator at home, unusual but not out of the norm. Many aviation enthusiasts have similar setups; one Los Angeles flight attendant recreated a Pan Am first class cabin in his garage. Investigators are now trying to restore files deleted from that simulator.

Why suspect the pilots? The plane's transponder stopped signaling its location to air-traffic controllers and other planes at the perfect moment: the handoff from Malaysia's controllers to those in Vietnam. In the final radio contact from the plane, the co-pilot told Malaysian controllers "All right, good night." Vietnamese controllers were never contacted and the transponder shut off. The plane abruptly turned and then kept flying for up to seven hours.

The way several key communication and tracking devices in the cockpit were disabled — at different times — also places suspicion on the pilots.

The idea of pilots using a plane to commit suicide and mass murder is scary, taboo within the industry but not unprecedented. A SilkAir crash in 1997 and an EgyptAir crash in 1999 are both believed to have been the result of deliberate actions by pilots.

— TERRORIST HIJACKING

This theory was prominent early on after it was discovered that two Iranians on board — one 18, the other 28 — were traveling on stolen passports. Investigators haven't found anything linking either to terror groups; it is believed they were trying to illegally immigrate to Europe.

Ever since 9/11, it's much harder for an unauthorized person to enter the cockpit. Cockpit doors have been reinforced and procedures have been put in place to ensure nobody gains entry when a pilot exits. And passengers and crew have shown a willingness to confront anyone trying to take over or damage a plane.

Could someone have been allowed into the cockpit? It's against protocol, but does happen. Back in 2011, Flight 370's co-pilot and another pilot invited two women boarding their aircraft to sit in the cockpit for an international flight. During the journey, the pilots smoked and flirted, one of the women said this month.

Still, no credible group has taken credit for the disappearance and intelligence agencies say they haven't noticed any chatter in terrorist circles regarding the jet.

— SUDDEN CATASTROPHE

Aviation experts initially suspected that something sudden and horrific happened. Perhaps a bomb on board, or some type of failure with the engines or airframe. But if that were the case, debris would have been found in the spot where the transponder went off. Also, the Boeing 777 has just one fatal crash in its 19-year history — last year's Asiana Airlines crash in San Francisco. If there was a sudden breakup, pieces of the plane would have been visible on radar.

— FIRE

An electrical fire, or perhaps a fire from hazardous cargo, could have knocked out communications equipment and prevented crewmembers and passengers from calling for help. Some people have speculated that smoke incapacitated the pilots. It's possible, but flight attendants and passengers would have had time to try to enter the cockpit and take control of the plane.

— DECOMPRESSION

A slow or sudden decompression, causing a loss of oxygen, could have killed everyone on board. If oxygen levels dropped, a loud, automated warning would have alerted the pilots to put on their oxygen masks and immediately descend below 10,000 feet, where there is enough oxygen to breathe without aid.

If the plane depressurized and killed its occupants, which happened on golfer Payne Stewart's business jet in 1999, that would explain the silence from crew and passengers. But aviation experts say in that case, the plane should have kept flying automatically toward Beijing and been visible on radar.

— HIDDEN PLANE

It's possible that somebody landed the plane at some remote airport and is hiding it from the world. Maybe they want to hold the passengers hostage, although nobody has taken responsibility or demanded a ransom. Maybe there was something of value in the cargo hold — and this was the world's most elaborate robbery. Maybe terrorists have the plane and plan to load it with jet fuel and explosives and use it as a missile in the future.

Those scenarios all have holes. A very skilled pilot would have to land the plane at a small airport that normally doesn't accommodate 777s. They might have had to land in the dark, without normal navigation aids to assist. And they would have to dodge several nations' radar systems, though some have suggested that it stealthily flew in another jet's shadow.

Yet it's hard to rule out anything. It took Thailand's government 10 days to acknowledge that it spotted what might have been Flight 370 on its radar. Governments aren't necessarily open to sharing all their information, especially when it comes to their military radar capabilities.

But why go to all the trouble of stealing a commercial jet? A cargo plane would be easier to steal.

— ACCIDENTAL SHOOT-DOWN

Civilian aircraft have been unintentionally shot down by a country's military. In July 1988, the United States Navy missile cruiser USS Vincennes accidently shot down an Iran Air flight, killing all 290 passengers and crew. In September 1983, a Korean Air Lines flight was shot down by a Russian fighter jet. There is no evidence that Flight 370 was brought down by a government entity.

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AP writer Joan Lowy contributed from Washington.

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Scott Mayerowitz can be reached at http://twitter.com/GlobeTrotScott

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