[Danfried]

I think Doktorwzzerd is right. Only seven Americans are recognized as having flown in the BoB, out of thousands of pilots. (Note that this number includes those pretending to be Canadian. Legally, Americans were not supposed to fight in foreign militaries at all.) The Eagle Squadrons didn't become operational until the BoB was well over.

Are these pilots speaking with "American" accents actually Canadians? That might make more sense -- except according to my aged high school English teacher who was alive at the time (I'm Canadian), most Canadians prior to WW2 spoke with British accents; during WW2 many might still have sounded British. It was probably the influence of American television (or perhaps radio) that caused our accents to gradually sound more American over time. Can any other Canadians confirm this?