limerickman said:I can't find any data on US involvement 1939-1941.
Tried Yahoo, Google - zilch.
Then you're not trying very hard
The Flying Tigers - flying from 1937-1943
http://www.flyingtigersavg.com/tiger1.htm
The American Eagles - flying from 1937-1943
http://www.rollmodels.net/nbookreview/classicpubs/amervols/amervols.php
Ten American pilots in the Battle of Britain in 1940http://www.taphilo.com/history/BofBamericanpilots.shtml
244 pilots volunteered for the Eagle squadrons in 1940
http://history.acusd.edu/gen/WW2Timeline/eaglesquadron.html
American Volunteer Fighter Pilots in the RAF, 1937–43
http://www.airpower.maxwell.af.mil/airchronicles/bookrev/holmes.html
Eagle Squadrons
http://www.fourthfightergroup.com/eagles/es.html
Have I made my point yet, or do I need to paste the other *10 pages* of search results in as well?
You're either a liar or you're hopelessly incompetent w/ Google. I didn't even try Yahoo - got all of these results the first try on Google.