Good WWII aviation books:
The Few, by Kershaw (The first Americans in the Battle of Britain)
Masters of the Air, by Miller (8th AF, stories from strategic to tactical, awesome)
Unbroken, by Hillenbrand (B-24 crewman, incredible tale of survival)
Fighter Pilot, by Olds (autobiography of Robin Olds)
JG26: Top Guns of the Luftwaffe, by Caldwell (daily history of JG 26)
The First and the Last, by Galland (Galland's tale)
Zemke's Wolfpack, by Freeman (P-47's, Zemke, Johnson, Gabreski)
Top Guns, by Foss and Brennan (excellent collection from pilots)
Samurai, by Sakai (Saburo Sakai's story)
Midway, by Fuchida and Okumiya (Midway and a lot more by guys who were in the action)
Intrepid, by White and Gandt (detailed stories of USS Intrepid)
FLAK, by Veitch (stories from RAF, RAAF, RNZAF pilots)
Baa, Baa Black Sheep, by Boyington (Pappy's tales)
Aces High, by Yenne (about Bong and McGuire)
A Dawn Like Thunder, by Mrazek (detailed stories of VT-8)
America's Hundred Thousand, by Dean (nonfiction detailed info on all US WWII fighters)
The Lockheed P-38 Lightning, by Bodie (awesome nonfiction book on the P-38)
The Wild Blue, by Ambrose (B-24 stories)
Flying Through Midnight, by Halliday (interesting tales of a C-123 special-ops pilot)
Good WWII books (not mainly aviation):
With the Old Breed, by Sledge (if a person reads only one book on war, this should be it)
Neptune's Inferno, by Hornfischer (awesome account of the Guadalcanal campaign)
A Measureless Peril, by Snow (awesome story of US battle in Atlantic)
One Man's War, by LaMore (awesome story of fighting and survival)
To Hell and Back, by Murphy (Audie Murphy's story)
Last Stand of the Tin Can Sailors, by Hornfischer (awesome account of Battle of Leyte Gulf)
The Bravest Man, by Tuohy (WWII submarine combat)
Band of Brothers, by Ambrose (famous)
No Simple Victory, by Davies (excellent academic history of WWII from angles not usually presented in the West)
Army at Dawn, by Atkinson (North Africa)
The Day of Battle, by Atkinson (Italy)