Pauline uses many forms of transportation on her quest for the secret formula for the invisible gas that destroys civilizations. Among them are several airplanes. In episodes 5 and 6 there are good examples of single engine airplanes from the early 1930's. Later, in episodes 7 and 8, Pauline is shown as a commercial passenger on a huge multiengine flying boat. The serial includes historic shots of the take off and landing of the 12 engine Dornier Do X flying boat, the largest and most powerful airplane ever built when it was completed in 1929. It was so heavy that the 12 600 horsepower engines could only lift it to 1600 feet! It was so clumsy that the passengers were asked to crowd together on one side when the airplane was turning. It held the record for the most passengers (169) in one plane. That record was not broken until 1945.
The Do X made only one transatlantic flight, via Africa and South America with 100 passengers. It landing in New York City on June 4, 1931. When it finally returned to Berlin, it was retired and placed in a museum.
Episode 8 shows the festivities associated with that historic landing. There are shots of actors boarding the plane, and some interior shots as well. The images of the Do X are the high point of the entire serial.