Chickenhawk was excellent. I also enjoyed Sagitarius Rising by Cecil Lewis and I remember Gemini to JoBurg being pretty good as well.
Serenade to the big Bird [flying B17s out of England] was well written and made an impact on me because I was twenty three when I read it, the same age as the author.
Not strictly speaking a flying book, but West with the Night was good too.
I read Rocket Fighter, the story of an Me 163 pilot and it contained the sobering passage where he described day one of the course where they threw a pork chop into a bucket of H2O2, so everyone cold see it dissolve. Served as a useful reminder of what their fuel could do to them.