RCAF Station Lachine was a Royal Canadian Air Force station located near Lachine and Dorval, Quebec, Canada, to the west of Montreal. The location of the station was Dorval Airport, which became the Montréal-Dorval International Airport (now Montréal-Pierre Elliott Trudeau International Airport). RCAF Station Lachine began operation in 1941 as a transit point for the ferrying of aircraft and the transportation of supplies to Europe during the Second World War. Until 1943, Lachine was the location of one of five British Commonwealth Air Training Plan (BCATP) manning depots, No. 5 Manning Depot.