By the time of last radio contact , something was likely already awry . FAA officials believe the jet may have flown for hours after last contact with the pilots . Pilot 's instructions : Aviate , navigate , land ; communication cut off . Not long after the flight took off from Kuala Lumpur communications systems were disabled , the plane 's transponder was turned off , Malaysian Prime Minister Najib Razak said Saturday . Was a third person with them in the cockpit ? One pilot has let me in before .
By the time of last radio contact , something was likely already awry . FAA officials believe the jet may have flown for hours after last contact with the pilots . Pilot 's instructions : Aviate , navigate , land ; communication cut off . Was a third person with them in the cockpit ? One pilot has let me in before .