Surprised that Winged Victory by V M Yeates has only had one mention that I can see, on page 4 by Jabberwok. Best ever book about flying, and the futility of war, in this case WW1, that I have read. It has been out of print for ages, but I have recently received a newly published paper back copy, sourced through that well known booksearch website. It has SE5s rather than Sopwith Camels on the cover, and doesn't have the introduction by Henry Williamson the previous reprints had, but well worth looking for.
Wish I had a hard back copy, the local library here has a very tatty one which I keep trying to convince them to sell me, but they say it is still in demand, and I can't convine them I am the only one who keeps demanding it!