What kind of WWII aircaft is this?
A North American T-6 Texan Trainer, probably the NJ/SNJ Texan variant.



"SNJ-1 at NAS Pensacola c1940" by U.S. Navy - U.S. Navy National Museum of Naval Aviation photo No. 1996.488.166.090. Licensed under Public Domain via Commons.

The North American Aviation T-6 Texan is a single-engined advanced trainer aircraft used to train pilots of various air forces including (but not limited to) USAAF, USN, RAF from (before) WWII well into the 1970s.