1934 USA AIRMAIL FIRST FLIGHT to POLAND, a cachet FFC from NEW-YORK on JUN27,1934 to WARSAW with arrival JUL 2nd, postage is paid by 2¢ USA stamp and Poland #C4 pays the airmail surcharge, the cover is signed by both pilots Benjamin & Joseph Adamowicz, a quite scarce early pioneer Trans-Atlantic flight with dual country franking, retails $150 US, F-VF est ($75+US) (Image)

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1931 SHIP to SHORE AIRSHIP TRANSFER, cachet cover for the first airship GOODYEAR transferring mail to the SS CITY of LOS-ANGELES, it was posted on arrival at SAN-PEDRO-CAL on JUN12,1931, VF est ($35+US) (Image)

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1936 HINDENBURG FIRST USA FLIGHT, on registered cover from LORCH on MAY2,1936 to NEW-YORK with flight cache and arrival MAY 9th, VF est ($75+US) (Image)

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