http://home.att.net/~jbaugher/usafserials.html
David

Update: This site also has the USMC and USN serials as well.
The site link is no longer active and has been replaced by a newer link:dabbydo wrote: ↑17 Sep 2006 15:52If you are trying to identify an American aircraft that was sent to lend-lease, wrecked, or just looking for a particular plane, ALL serial numbers for USAF planes are at this site.
http://home.att.net/~jbaugher/usafserials.html
David
Update: This site also has the USMC and USN serials as well.