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In the pioneering early days of aviation, mechanics often flew in the right seat of the cockpit and could perform co-pilot duties if needed. A basic tool kit, usually in a canvas roll-up for lightweight portability, was always onboard. A good supply of extra spark plugs was packed for frequent refueling stops, when a quick tune up could ensure that all cylinders were firing. Learn more about the early days of aviation in "Flying the Main Line: A History of United Airlines" on display, post-security, in Terminal 3. http://bit.ly/TheMainLine Image: National Air Lines/United Air Lines mechanic roll-up tool set, late 1920s. Collection of United Airlines Archives. L2017.1502.036 This image was posted on July 13, 2017.

This post mentions the following things involved with the SFO Museum collection:

United Airlines. It is related to United Airlines (the company) .