Identifying aircraft is always a tricky business. For RAF there are a variety of books available, and some sites discuss individual aircraft, types and/or squadrons. However, there is not, currently, a single internet resource comparable to the Air Britain books. However, there are a number of resouces for allied air forces: Canadian Serials: http://www.ody.ca/~bwalker/ Australian Military Aircraft Serials http://www.adf-serials.com/ New Zealand Military Aircraft Serials http://nz-serials.adf-serials.com/ US Serials - USAAF, USN etc http://home.att.net/~jbaugher/usafserials.html