Aerophilately
Aerophilately is the branch of stamp collecting (philately) dedicated to the study and collection of airmail, including stamps, covers, aerogrammes, and any other postal or non-postal paper related to mail transported by air.
Australian Aerophilately can trace it's beginnings back to the first Air Mail flight undertaken by French aviator Maurice Guillaux in his Bleriot XI monoplane between July 16th and 18th, 1914. Seven years later, the first regular domestic airmail service began after the Air Navigation Act 1920 came into force in 1921 when Norman Brearley won the tender to operate a subsidised airmail and passenger service in the north-west of Western Australia, where mail delivery by steamship took about two weeks.
One of the largest collections of Aerophilately in Australia was that of the late Eric Crome, who had an interest in all aspects of aviation. It is said that he witnessed the return in Sydney of the Vickers Vimy piloted by Ross and Keith Smith, at the end of the first flight from England to Australia. He began collecting aviation material, particularly flight covers and other aero-philatelic items, and continued to do so all his life.
You can view 19 albums of the Crome Collection online via Trove by clicking this link to the National Library of Australia