1938 Imperial Airways flies first transatlantic air-mail service. Pan American and Imperial Airways begin transatlantic passenger and mail services. 1940 Atlantic Ferry Organisation begins operations with first flight of seven Hudson bombers from Gander, Newfoundland to Aldergrove, Northern First using civilian crews. 1947 First four ocean weather ships provide data for trans-Atlantic flights. Britain adopts US system of paper flight progress strip for monitoring air traffic.
User charges begin to recover cost of trans-Atlantic communication and air traffic control services.
1956 Selective call device removes need for constant listening watch on control frequencies. New Oceanic and Scottish Airways Centre re-sited in wartime building alongside Redbrae House. 1961 First occasional use of north-Atlantic tracks. 1962 Submarine communication cable links Shannon and Prestwick with control centres in Iceland, Greenland and Newfoundland. 1967 Oceanic Control Centre at Prestwick moves to new location, but still in wartime hut.