A very cool juvenile book written by the sci-fi/fantasy writer Julian May and illustrated by Robert Barker.
From the dust jacket:
Look up in the sky! It’s full of planes. Airliners, cargo transports, small private planes, military jets – they are all part of the world of modern airplanes.
This easy-to-read book describes them all, and explains what keeps them up in the air. “Here, written in a clear, lively style, are the answers to questions asked by many air-minded young readers. Scores of detailed illustrations enrich the book.
A glossary of aeronautical terms is at the end of the book.