How does a plane of this size just disappear?
Check it out:

U.S. investigators searching for missing Malaysian Airlines Flight 370 believe the plane could have flown for another four hours after its last confirmed location.

Data from the plane’s Rolls Royce engines, which was apparently automatically transmitted during the flight, indicate the Boeing flew for hours after losing contact with air traffic control and dropping off radar, according to a Thursday Wall Street Journal report.

The new evidence led U.S. officials to question whether the passenger jet carrying 239 people may have flown off course deliberately so someone could use it later “for another purpose,” according to a “person familiar with the matter.”