A senior Malaysian official said Sunday that one of the plane's pilots -- either Capt. Zaharie Ahmad Shah, 53, or co-pilot Fariq Abdul Hamid, 27, or an unknown person -- spoke to traffic control after the plane diverted from its flight path and after its signaling system had been disabled.
"All right, good night," someone reportedly told air traffic control.
“This will tell you something…because this is something not normal that the pilot would do,” Malaysian Air Force Maj. General Affendi Buang said of the mysteriously calm last words.
U.S. intelligence officials have already been looking into the possibility that one or both of the plane's pilots are responsible for its disappearance. Authorities began searching Shah's home on Saturday.