I just recently received couple very rare airmail labels from Australia's Qantas airways. The labels are in nice red color and was issued before 1930's.
Year: 1925, Gummed. Günter Mair's catalogue no: - AUS-B-4d, perforated H 11, V strips of 6, blak/red, 6******
Year: 17.4.1929, Gummed. Günter Mair's catalogue no: - AUS-B-7a, imperforated, intended for mail by 1.flight Brisbane - Charleville, 17.4.1929, black/bright red/white, 6******