KUALA LUMPUR, Malaysia (AP) -- The Wall Street Journal is reporting that U.S. investigators suspect a missing Malaysian jetliner flew on for four hours once it lost contact with air traffic controllers.
The suspicion is based on data from the plane's engines that are automatically downloaded and transmitted to the ground as part of routine maintenance programs.
The report raises questions as to why the Boeing 777 was flying like that, and if anyone was in control during that time.
The plane's last known confirmed position was roughly halfway between Malaysia and Vietnam.
Malaysian authorities have since said they tracked what could have been the plane changing course and heading west.
Investigators have not ruled out any possible cause to explain the disappearance of the plane and the 239 people on board.