OBJECT SHOWCASE: U.S.
Airmail Stamped Envelopes
Post Office Department airmail pilots never
carried U.S. airmail stamped envelopes. The first U.S. air
post stamped envelopes became available to the public on January
12, 1929. These stamped envelopes carried the red and blue
border design that marked U.S. airmail stationery for most
of the 20th century.
Here are some examples of U.S. airmail stamped