 "Wal" flying boats were used, catapult launched for the trans-Atlantic leg These were replaced by the Dornier Do 18 in 1936 making operations in non-visual conditions possible.The European network saw the introduction of the Junkers G.38 (at that time the largest passenger aircraft in the world) on the Berlin-London route via Amsterdam, as well as the Junkers Ju 52/3m and Heinkel He 70, which allowed for faster air travel.This was promoted by so-called "Blitz Services" (German