Had to share this one. May 6, 1937. It was intended for the return trip of the Hindenburg to Germany - zeppelins provided the first regularly scheduled transatlantic airmail service in the US (plane service wouldn't start till 1939).
This was the return trip that never happened - Hindenburg caught fire and crashed about 6 hours after this cover was postmarked while attempting to land at Lakehurst NJ.
