Prezentat acum: Statele Unite (SUA) - Timbre Par Avion (1918 - 2012) - 5 timbre.
27. Aprilie WM: Niciunul Perforare: 11
![[Aviation Pioneers - Harriet Quimby & Blériot XI Monoplane, Tip CV]](https://www.stampworld.com/media/catalogue/United-States/Airmail-stamps/CV-s.jpg)
![[Aviation Pioneers - Harriet Quimby & Blériot XI Monoplane, Tip CV1]](https://www.stampworld.com/media/catalogue/United-States/Airmail-stamps/CV1-s.jpg)
17. Mai WM: Niciunul Perforare: 11
![[William T.Piper, Tip CW]](https://www.stampworld.com/media/catalogue/United-States/Airmail-stamps/CW-s.jpg)
21. Iunie WM: Niciunul Perforare: 11
![[Antarctic Treaty, Tip CX]](https://www.stampworld.com/media/catalogue/United-States/Airmail-stamps/CX-s.jpg)
12. Octombrie WM: Niciunul Perforare: 11
![[America PUAS - First Americans Crossed over from Asia, Tip CY]](https://www.stampworld.com/media/catalogue/United-States/Airmail-stamps/CY-s.jpg)
