The Avro Lancaster PA278 disappearance involved Avro Lancaster Mk.I PA278, "F for Freddie", operated by No. 103 Squadron RAF (103 Sqn) of Bomber Command just after the end of the Second World War. It disappeared over the Mediterranean, probably near Corsica, on 4 October 1945 with its crew of 6 airmen and 19 female service personnel - the worst loss of female British and Commonwealth service personnel from the Second World War to date.