* Enter the civil registration or military serial of a specific aircraft. Make sure you have the right format, especially hyphenation e.g. N737B (US civil registrations), 98-0081 (USAF), PH-BZB (European civil registrations), ZA111 (UK military), MM81821 (Italian military).
** These categories are applied to individual aircraft, whereas the categories in the "browse by aircraft type" pages include only aircraft types specifically designed for that purpose. So, for example, you can use the commercial cargo carrier category here to search for all non-military freighters including converted airliners.