Local name is Fordel
Airfield no... In the Lothians dialect and particularly more and more towards Stenton and East Lothian there is a remnant of "field" becoming pronounced as "fiedel". This habit was common in 19th century dialect in other parts of Lowland Scotland. The local name "Fordel" however persists. So the proper name "field" was spoken as "fiedel" in the broad tongue and the locality became anglicised into "Fordel".
Cheers