Has anyone mentioned "North to the Orient" by Anne Morrow Lindbergh? apologies if so, missed it on brief scroll through the thread.
(Almost) everything by St Exupery (only one brief mention above?) should be on the essential reading list. You asked for non fiction, but St Ex's novels are informed by his own experiences.
Additional war memoirs: Pierre Clostermann's "The Big Show" is available in translation, although for the expanded version, "Le Grand Cirque 2000" you need to read French . See also the memoirs by Hugh Dundas and Neville Duke.
As I never fail to observe when this thread comes up: Bach is a load of old ********. New age pseudo-spiritual meanderings, bah, humbug. I could get higher from smoking teabags. Pass the bong.