Bourn Airport (IATA: n/a, ICAO: EGSN) is located 7 NM (13 km; 8.1 mi) west of Cambridge, Cambridgeshire, England. The airfield was originally constructed during World War II as RAF Bourn and was principally used as a base for heavy bombers - Wellingtons, Stirlings and Lancasters were all based at Bourn at one time or another.