Visar nu: USA - Flygpostsfrimärken (1918 - 2012) - 3 frimärken.
15. augusti WM: Inga Perforering: 11
![[Airplane Radiator and Wooden Propeller, Typ B]](https://www.stampworld.com/media/catalogue/United-States/Airmail-stamps/B-s.jpg)
17. augusti WM: Inga Perforering: 11
![[Air service Emblem, Typ C]](https://www.stampworld.com/media/catalogue/United-States/Airmail-stamps/C-s.jpg)
21. augusti WM: Inga Perforering: 11
![[De Havilland Biplane, Typ D]](https://www.stampworld.com/media/catalogue/United-States/Airmail-stamps/D-s.jpg)
