The first edition of Flying has the letters ABCD on page 160. Cover price is $1.25. Copyright © 1971 by Western Publishing Company, Inc. Published by Golden Press, New York, N.Y. Listed as a Golden Science Guide. (image #1)
The only cover change to Flying is the large (5 ¼ by 7 ¾ inch)hardcover. © 1971 by Western Publishing Company, Inc. This edition has an A on the last page. Which is really strange. Because the earlier edition exists in a large hardcover as well. And it also has the letter A on the last page. It's like they changed covers in the middle of the print run. ISBN 0-307-64345-X on the back cover. (image #2; not shown to scale)
A German edition of Flying is shown last. © by Western Publishing Company, Inc. On the copyright page is the following: Luftfahrt - Verlag Walter Zuerl D-8031 Wörthsee - Steinbach.
Barry Schiff has an excellent website. Some of the books written by him can be purchased through his website. Click on the Barry Schiff Logo and check it out. Especially if you love flying.
No revised edition exists. Out of print.