Commando (Air Ministry serial number AL504) was a very long range Consolidated Liberator II aircraft adapted for passenger transport, to serve as the personal aircraft of Prime Minister Winston Churchill. Commando disappeared without a trace on 27 March 1945 over the North Atlantic Ocean, while on a flight from RAF Northolt to Lajes Field in the Azores, en route to Ottawa in Canada. The cause of the disappearance of the aircraft remains unknown to this day.