The Royal Air Force (RAF) operated from two locations in the Imperial fortress colony of Bermuda during the Second World War. Bermuda's location had made it an important naval station since US independence, and, with the advent of the aeroplane, had made it as important to trans-Atlantic aviation in the decades before the Jet Age. The limited, hilly land mass had prevented the construction of an airfield, but, with most large airliners in the 1930s being flying boats, this was not initially a limitation.