Pan American Clippers: The Golden Age of Flying Boats, by James Trautman (2019)
A beautifully produced and illustrated volume combining lots of Pan Am memorabilia, first hand accounts, along with a concise history of the airline’s romantic days. 2019 2nd Ed., is revised and expanded.
https://www.amazon.com/Pan-American-Clippers-Golden-Flying-dp-0228102308/dp/0228102308/