The Pan Am Journey, by Tom Kewin (2005) (**)
Tom Kewin started with Pan Am as an apprentice flight engineer on flying boats, and finished his career on 747's. He shares some of his experiences in this great little book.
The author started his aviation journey on March 11, 1943 when Pan American Airways hired him as an apprentice Flight Engineer. From the China Clipper to the Jumbo 747 it was a wonderful forty-year trip. You’ll find Kewin's accounts of the airplanes, the people, the places, and the airline interesting and enlightening.
https://www.amazon.com/Pan-Am-Journey-Thomas-Kewin-dp-1413486029/dp/1413486029/