[Answer] Which of the following was NOT a Golden Age of Aviation innovation?

Step 1 : Introduction to the question "Which of the following was NOT a Golden Age of Aviation innovation?"

...During The Golden Age of Aviation (1918-1939), flight technology saw major innovations. During this period, planes became faster, safer, and more efficient at a rapid rate, while ticket prices also became more affordable.

Step 2 : Answer to the question "Which of the following was NOT a Golden Age of Aviation innovation?"

Nitrogen gas as fuel:

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