Hi
This site does all american aircraft types.
http://home.att.net/~jbaugher/usafserials.html
scroll down to :-
Serial Number Listings by Fiscal Year: 1922-present
then click a link & start searching...
this might be worth a try
Search Engine
If you want to search this site for a serial number or for a particular aircraft type, go to Jeremy Kuris's search engine:
http://users.rcn.com/jeremy.k/serialSearch.html
good luck
cheers
Jerry