Canada:1918, July. 8., Calgary to Edmonton flight by Miss Katherine Stinson, folded letter from the manager of the Calgary Industrial Exhibition (under the auspices of which the flight was made) and signed by the manager, franked by two War Tax 2c + 1c stamps, one of which is tied by boxed "Aeroplane Mail Service JULY 9, 1918.CALGARY ALBERTA" cachet/ds, with Edmonton bs (July 9) and addressee's s/l receiver (July 10). Very few covers from this flight have survived, and not all of those have the cachet/ds, very fine (AAMC PF-7) (Image)

1920, AUSTRALIEN, Ross Smith airmail vignette tied by oval cachet "FIRST AERIAL MAIL GREAT BRITAIN TO AUSTRALIA 26. FEB.1920” to cover to Adelaide, fine, signed E.Diena, scarce (Image)

1927 May 20: THE PINEDO & PRETE FLIGHT - Envelope with 1927 60c black tied by St. John's machine cancel with Trepassey cds adjacent, SIGNED BY PINEDO, Rome arrival bs, backflap missing otherwise fine and rare. Certificate Fiorenzo Longhi (2014). ÷ DE PINEDO ATLANTIKFLUG 1927, 60 C Überdruckmarke auf prachtvollem Flugbrief ST. JOHNS, NFLD. MAY 20 1927 via Trepassey und Rom nach London, zusätzlich mit eigenhändiger Signatur "F.de Pinedo" in roter Tinte! Fotoattest Fiorenzo Longhi: "bis heute mir einzig bekannter Beleg mit Unterschrift von Francesco de Pinedo". (SG 163, Muller 13, Scott C4, Yvert A4) (Image)