All the known squadrons with flights, missions or departures in the period September 1939 - 8 May 1945 are plotted now on maps. From each squadron you can see the locations of their tasks with detailled information (link to the story and photo, if there).
Back to Normandy also published this information in GPS format for the App. See elswhere how to use this free App.
To see the overview of all the WWII squadrons who has flown for the liberation of Western Europe: http://www.backtonormandy.org/maps/squadrons.html