Deutsche Luft-Reederei (D.L.R), founded in 1917, was the first German airline to use heavier than air aircraft. DELAG was the first airline in the world, but flew lighter than air airships supplied by the Zeppelin company. D.L.R.'s first air services began on 5 February 1919. The company used a stylised crane, designed by Professor Otto Firle, as its logo.