I got 1000s of stamps and coins from my grandfather but these 3 covers were some that he like the best.
First is a First Flight to the Merchandise Mart Oct 1,1946 Chicago. No real idea about it. Any value or info would be great
Second is an orbited cover from the Challenger launched 8/30/83 and returned 9/5/83
Third and my favorite. A round trip on Lindbergh Again Flies the Air Mail.. sent from Chicago 2/21/28 4am, received Saint Louis 2/21/28 12. Returned same envelope 2/23/28 from St.Louis to Chicago...
Thoughts, comments, value ideas? Thanks for the help. Maybe I'll post some more if anyone has any interest.