August 15, 1923
8¢ Dark Green
Airplane propeller and radiator
Scott #C4

August 17, 1923
16¢ Dark Blue
U.S. Air Mail Insignia
Scott #C5

August 21, 1923
24¢ Rose & Blus
Curtis Jenny Biplane
Scott #C6

February 13, 1926
10¢ Dark Blue
Map of the U.S. & two planes
Scott #C7

September 18, 1926
15¢ Olive Brown
Map of the U.S. & two planes
Scott #C8

January 25, 1927
20¢ Yellow Green
Map of the U.S. & two planes
Scott #C9

June 18, 1927
10¢ Dark Blue
Spirit of St. Louis
Scott #C10

July 25, 1928
5¢ Carmine & Blue
Beacon on Sherman Hill
Scott #C11