After the war he became a citizen of newly established Czechoslovakia where he in 1919 co-founded Ikarus, one of country's pioneer civil aviation companies; two years later founded another company, air travel named Weltbäderflugverkehr ("World Spa Air Transport"), which operated on the line between the capital Prague and famous spa towns of Marienbad (Mariánské Lázně) and Karlsbad (Karlovy Vary) etc. in western Bohemia. Also while in Czechoslovakia, he helped select sites for new airfields. Later, when he became an ardent National Socialist and joined (1928) the German National Socialist Workers' Party (Czechoslovakia), was involved in espionage for the Third Reich. In 1934 moved to Berlin and two years later he obtained Austrian citizenship.