Pilot of doomed Flight 4U 9525 jet was 'locked out of cockpit

One of the pilots of the ill-fated Germanwings plane was locked out of the cockpit minutes before the aircraft plummeted into a remote region of the Alps, it was sensationally claimed last night.

Audio files taken from the black box voice recorder that was salvaged from the wreckage of the Airbus A320 reportedly indicate the pilot left the cockpit and could not re-enter.