Can anyone tell me where the 310th Ferrying Sqn was stationed in England in the Second World War (APO 685)?

Question

Or can you tell me how to find Army Post Office code numbers like 685 in 1944.

Answer 1

I don't know about the APO codes, but this iste suggests the 310th Ferrying Squadron was posted at the USAF Burtonwood base near Warrington.
http://www.astrecks.co.uk/peakaircraftwrecks.htm