DELAG
DELAG, acronym for Deutsche Luftschiffahrts-Aktiengesellschaft (German for "German Airship Travel Corporation"), was the world's first airline to use an aircraft in revenue service. It was founded on 16 November 1909 with government assistance and operated Zeppelin rigid airships manufactured by the Luftschiffbau Zeppelin Corporation. Its headquarters were located in Frankfurt, Germany.
Read more about Delag.