The digital collection First World War: Royal Flying Corps is part of the digitized Special Collections at Wichita State University, Fairmont, KS. This digital collection contains papers from the English brigade general R.M. Groves, notes about the RFC, two albums with aerial photographs showing the region in Flanders around Messines and Passchendaele before and after the battles in 1917, and aerial photographs with a report on a bomb raid on Vienna in 1918 led by the Italian poet Gabriele d’Annunzio. In the accompanying finding aid the materials (three boxes) are concisely described. You can browse this collection, use the free text field search or the advanced search mode.
Wichita State University has also a small general First World War collection, a collection on operations and intelligence of the British First and Second Armies, and twenty letters from British soldiers serving at different fronts.