(CNN) — A Boeing 777, one of the world’s most reliable types of airliners, is missing, and no one knows why. Was it a bomb? Mechanical failure? A hijacking gone awry? Pilots and others in the aviation community are deeply disturbed by the mystery surrounding Malaysia Airlines Flight 370.
It disappeared Saturday en route from Kuala Lumpur to Beijing over the Gulf of Thailand, somewhere between Malaysia and Vietnam. It’s hard to believe that such huge questions remain three days after the Boeing 777-200ER went missing, carrying 227 passengers and 12 crew members. These questions are so unprecedented that experts have been carefully speculating about possible explanations.
Here are four scenarios they’re talking about, and the related facts.