sentences:  Following the fall of France (22 June 1940), on 26 June 1940 the BOAC Lisbon service was switched to the DC-3s chartered from KLM with Dutch crews; by August 1940, five DC-3s were registered in Britain to a KLM subsidiary, nominally based at Heston.In late August 1940, all BOAC aircraft still based at Heston were transferred to Whitchurch, including the KLM DC-3s.For the Lisbon service, a DC-3 would fly to Heston to pick up passengers, then return to Whitchurch for onward travel to Lisbon.