Australia 1931, First flight Australia England - 2 covers:

• KLM, Fokker FVIIA/3m trimotor Registered first flight cover sent from Melbourne, Australia and addressed to London, England cover bearing multi franking of 1931 Kingford Smith's World Flights 6d  in a block of 6 plus singular (Mi:AU 112 ; Yt:AU PA3, SG 123) and 3d (Mi. 96; SG 122) all stamps are tied by Register postmark May 22. On the reverse is the cachet for the "Australia-Netherlands Indies Special Air Mail Flight - May 1931 Melbourne to Batavia". This flight left Melbourne on May 27, 1931 and arrived in Batavia on May 27, 1931. 
• April 1931 Imperial Airways, First official flight British Commonwealth Australia - England, air letter bearing mixed franking of 1931 Kingford Smith's World Flights 2d, 3d, 6d (SG 121-123) & 1929 Airmail 3d. (Mi:89, SG. 115) both tied by 'Toorak VIC / April 22 1931', On reverse 41/2d  in mixed franking (SG 116 & SG 117 x2) also tied by Toorak  April 22, also rubber hand stamp in violet commemorating the 'FIRST OFFICIAL AIR MAIL FLIGHT' from Melbourne to London.

Irland Stoltz, Pernambuco, Brazil, 1s, 9d, and 1/2d defines., GAILLIMH double-ring CDs, green AER POST/GAILLIMH-BERLIN cachet of first flight, red LUFTPOSTAMT/BERLIN handstamp, circular red and hexagonal orange handstamp of 9th South American Flight of the Graf Zeppelin, Pernambuco receipt CDs on the reverse of October 27. Adhesive tape at the left edge and on reverse, otherwise fine. Scarce -Davis states only 25 flown.