Pneumatic Air Mail Correspondence

(A name we invented!) Air mail letters were treated as Express. Those posted in Vienna were sent pneumatically to the Central Telegraph Office, then taken by road to the airfield. Incoming air mail was similarly handled. This is shown by the cancellations.

20 July 1918: Krakow to Vienna	29 July 1918: Lemberg to Vienna to Graz	31 Dec 1929: Vienna to Germany.	Sept 1929: Catapult mail from New York to Vienna.	Jan 1933: Glider Post by Robert Kronfeld.
June 1934: London to Thomas Cook at Kärntnerring.	16 Aug 1934: Vienna to Germany.	20 Sep 1934: Vienna to England.	18 Mar 1935: Paris to Vienna.	Aug 1935: Catapult mail from Vienna to New York.
Aug 1935: Vienna to Czechoslovakia	17 Oct 1935: Germany to Vienna.	3 Dec 1935: Vienna to England.	28 Feb 1936: Germany to Vienna, registered.	May 1936: Letter to Baron Franckenstein in London.
Aug 1936: A Zeppelin letter from New York to Vienna.	11 Dec 1936: Poland to Vienna.	16 Mar 1937: Vienna to Johannesburg, South Africa.	June 1937: Letter from Vienna to London.	13 Sep 1937: Vienna to England.
28 Feb 1938: Vienna to England.	30 May 1938: Vienna to England.	Dec 1950: Letter from Vienna to Amsterdam.