Dennis Dillman, a stamp collector and rocketplane oficionado, has shared the following postal covers, all flown on X-2 flights. A "cover" is an envelope with a stamp, postmarked for an event. Dennis has collected other covers related to the XF-91, X-15 and lifting bodies. His collection, including the X-2 covers can be viewed in an online philatelic exhibit at Stamps.org.

A big thank you to Dennis for sharing these with us!

18 Nov 1955, Lt. Col. Pete Everest Flown Cover

24 March 1956, 1 May 1956, 11 May 1956 flown covers by Lt. Col. Everest.

22 May 1956, 23 July 1956 flown covers, again with Lt. Col. Everest flights.