1938/39 and RAF Northolt began preparations for conflict with Germany with two 2,400 ft runways being constructed. The RAF soon faced one of their toughest tests with RAF Northolt, supported by Canadian and Polish allies, playing a major part in the Battle of Britain.
At the end of WWII, RAF Northolt became the base for European flights operated by BOAC and became home to a number of operators including Swissair and Iberia. British European Airways (BEA) was founded at Northolt in 1946, with its head office located at the North side of the airfield. Scheduled services into Northolt continued with regular flights operated by companies such as Aer Lingus, SAS and Alitalia. During the 1950’s flights gradually transferred into the new Heathrow Airport and the final scheduled flight from Northolt was on the 30 October 1954.