Now that "Historical Scenarios" (HS) are being built with the TDF format, here is an excellent resource (5 books in all, by region) called "Airfields and Airmen" that gives all the details of just about every aerodrome on both sides on the Western Front, what squadrons and ace flew from them, airfield diagrams, even nearby cemeteries where pilots are buried:
http://www.amazon.com/AIRFIELDS-AIRMEN-YPRES-Battleground-Europe/dp/0850527538/ref=pd_rhf_p_t_2They are published by Pen & Sword, which is a British book company, and I'm sure are available at Amazon UK and other booksellers as well.
Lots of descriptions of missions from many fields to use as the basis for historical RoF encounters.
They were my primary guide to finding old aerodromes (now almost all returned to being farm fields) when I toured the Western Front last year.
Meanwhile, in the Freebie Department, this is a wonderful interactive aerodrome map and data base
showing what field operated on what dates and what squadrons were at those fields during different periods of time:
http://patriot.net/~townsend/WW1AirMap2/
You may have to copy and paste that addy into your browser's URL window as it doesn't show up as a link in SimHQ. But it does work.
A lot of work obviously went into the data base for this map.
Hope that helps some mission builders!
S!
HT