The Junkers W 33 was a German 1920s single-engine low-wing monoplane transport aircraft that followed Junkers standard practice making extensive use of corrugated aluminium alloy over an aluminium alloy tube frame, that was developed from the similar but slightly smaller Junkers F 13, and evolved into the similar W 34. One example, named Bremen, was the first aircraft to complete the much more difficult east–west non-stop heavier-than-air crossing of the Atlantic.

The Junkers F 13 is the world's first all-metal transport aircraft, developed in Germany at the end of World War I. It was a cantilever-wing monoplane, with enclosed accommodation for four passengers and a two seat open cockpit. 322 examples were manufactured, an exceptionally large number for a commercial airliner of the era, and were operated all over the world. It accounted for over a third of air traffic in the early 1920s. It remained in production for thirteen years and in commercial service for more than thirty. There were many versions including floatplanes for water landing, skis, mailplane, and different engines. Several survive in various states of repair in museums, and a replica of the type was put back in production in the 2010s, taking flight once again nearly a century after the type first flew.