Now showing: United States - Airmail stamps - 1980 - Aviation Pioneers - 2 stamps.
30. December WM: None Perforation: 11
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![[Aviation Pioneers, type BT]](https://www.stampworld.com/media/catalogue/United-States/Airmail-stamps/BT-s.jpg)
![[Aviation Pioneers, type BU]](https://www.stampworld.com/media/catalogue/United-States/Airmail-stamps/BU-s.jpg)
