Milch resigned from the military in 1920 to pursue a career in civil aviation. With squadron colleague Gotthard Sachsenberg, Milch formed a small airline in Danzig under the banner of Lloyd Luftdienst, Norddeutscher Lloyds union of regional German airlines. The airline linked Danzig to the Baltic States. In 1923, Milch became the managing director of its successor company. From there, Milch and Sachsenberg went to work for rival Junkers Luftverkehr, where Milch was appointed a managing director in 1925. In 1926, Milch was named a managing director (one of three) of the newly-formed airline Deutsche Luft Hansa. Milch joined the Nazi Party (number 123885) on 1 April 1929, but his membership was not officially acknowledged until March 1933, because Hitler deemed it desirable to keep the fact hidden for political reasons.