This Day in Aviation History
July 20th, 1925
First flight of the Boeing Model 40.

The Boeing Model 40 was a United States mail plane of the 1920s. It was a single-engined biplane that was widely used for airmail services in the United States in the 1920s and 1930s, especially by airlines that later became part of United Airlines. It became the first aircraft built by the Boeing company to carry passengers….

Wikipedia, Boeing Model 40:

YouTube, step back in time with the oldest boeing still flying:

Further Reading:
Antique Airfield, First Flight of Boeing Model 40C

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