Now showing: United States - Airmail stamps (1918 - 2012) - 3 stamps.
29. March WM: None Perforation: 11
![[The 350th Anniversary of the New Sweden Settlement, type CL]](https://www.stampworld.com/media/catalogue/United-States/Airmail-stamps/CL-s.jpg)
14. May WM: None Perforation: 11
![[Avaition Pioneers - Samuel Pierpont Langley, 1834-1906, type CM]](https://www.stampworld.com/media/catalogue/United-States/Airmail-stamps/CM-s.jpg)
23. June WM: None Perforation: 11
![[Avaition Pioneers - Igor Sikorsky, 1889-1972, type CN]](https://www.stampworld.com/media/catalogue/United-States/Airmail-stamps/CN-s.jpg)
Now showing: United States - Airmail stamps (1918 - 2012) - 3 stamps.
29. March WM: None Perforation: 11
14. May WM: None Perforation: 11
23. June WM: None Perforation: 11