b'52370 373370C 7 June 1924 (AAMC.72) Sydney - Adelaide registered flown cover carried on the inaugural service by Australian Aerial Services, with Adelaide arrival cds. $300350371371C 13-14 October 1928 (AAMC.126) New Zealand (Blenheim) - Australia (Sydney) cover, flown aboard the "Southern Cross" on it\'s return flight following the triumph of the first crossing from west to east in September (see AAMC.124). The crew comprising of Charles Kingsford Smith, Charles Ulm, H.A. Litchfield and T. McWilliams was the same; this rare cover being signed by Charles Ulm and addressed to his wife. [One of only 16 flown]. . $2,5003,500372C 17 April 1929 (AAMC.132a & 133a) Brisbane - Charleville - Normanton, and Brisbane - Toowoomba flown covers, both bearing the scarce "See Western Queensland" red airmail labels; both tied. (2). Cat.$400+. .$200250373C 17 April 1929 (AAMC.132a) Brisbane - Charleville - Longreach - Barcaldine flown cover with "INAUGURAL FLIGHT" vignette, backstamps and signed front and back by the pilot, P.H. Moody, and quite rare thus$150200374C May - June 1929 series of flown covers, all self-addressed to J.C. Westhoven, Deputy Director, Posts & Telegraphs, Melbourne and utilizing the services of A.A.S. and the newly established QANTAS routes. Despatches from Narrandera, Broken Hill, Toowoomba, Longreach, Roma, Tambo, Winton, Blackall, Camooweal & Mt. Isa. All correctly franked at 4d. (10).Westhoven had been responsible for the introduction of a new mail delivery protocol: His letter informing postal officials read as follows "On 1st February, 1928, a new system of address under which a Postal District Number placed after the name of the suburb, will indicate the proper office of delivery. Thus, N. 1. will indicate the area served from the North Melbourne Post Office, S. 2. the area served from St. Kilda. If the correct Post District Number is placed upon a letter, it can easily and accurately be sorted for the proper office." (10) .$250300'