Aug 1935: Catapult mail. The ship 'Bremen' set off from Europe, and when it was within range it catapulted off an aeroplane (with floats) which refuelled at Nantucket and brought the mail to New York. This item entered the postal system on 22 Aug 1935. There's an interesting mix of cancels: WIEN 110 ordinary; WIEN 110 pneumatic, TELE­GRAPHENAMT WIEN 1, and Frankfurt. The routing was from Vienna 110 (Währing) by tube to the Central Telegraph Office, then by road to Aspern, plane to Köln (Cologne if you prefer); to Cherbourg by a special flight, then ship, then catapulted plane. Rate: postcard 35 Groschen plus catapult surcharge of 60 Gro and Köln-Cherbourg surcharge of 10 Gro: total 105 Gro. The franking is only 96 Gro;  perhaps the K-C surcharge had been overlooked.