Domestic U.S. Air Mail was established as a new class of mail service by the United States Post Office Department (POD) on May 15, 1918, with the inauguration of the Washington–Philadelphia–New York route. Special postage stamps were issued for use with this service. Domestic air mail became obsolete in 1975, and international air mail in 1995, when the USPS began transporting First Class mail by air on a routine basis. All post-1977 United States stamp images are copyright of USPS. Scott cataloged stamps received a "C" designation for airmail issues beginning in 1940. Designated for international mail, and showing a small airplane, the January, 2012 $1.05 Scenic America series issue was designated C150. However, with the January, 2013 issue of the $1.10 Global Forever Stamp no specific airmail purpose was shown in the design. Rather, the Postal Service stated that this "stamp offers a single price for any First-Class Mail International 1-ounce letter to any country in the world." Thus a regular series Scott number, 4740, was designated.

1918–1919

Engravers: J. Eissler and Edward M. Hall || 8493 T, 8493 B || see [[Media:Inverted jenny400.jpg|also]] || ~100 (1 plate) Error Engravers: J. Eissler and Edward M. Hall || 8492 T, 8493 T || || 3,095,955 Engravers: J. Eissler and Edward M. Hall || F8900 T || || 3,793,987 Engravers: J. Eissler and Edward M. Hall || 1955 T, Unused plate: 9164 || || 2,134,988 Reference:

1920–1929

Engraved: H. Dawson and E. M. Weeks || 14824–14827 L (four plates) || || 6,414,576 Engraved: H. Dawson and E. M. Hall || 14828-14831 L (four plates) || || 5,309,275 Engraved: J. Eissler and E. M. Hall || 14840–14843 L (four plates) || || 5,285,775 19546 T (blue) || || 106,887,675 Reference:

1930–1939

(Air Mail Special Delivery) || 21313, 21313 F – Reprinted imperforate, 1935 (Air Mail Special Delivery) || 21497 F, 21495 F, 21493 || || 72,517,850 Reference:

1940–1949

(200 Subject Electric Eye Plates) || The Twin-Motored Transport Plane || Following are shared among the 1941 issues: 40 plates between 22752-23349 & 22756-9 (4 plates) || || 4,746,527,700 (200 Subject Electric Eye Plates) || The Twin-Motored Transport Plane || 23126 || || 1,744,878,650 (200 Subject Electric Eye Plates) || The Twin-Motored Transport Plane || || || 67,117,400 (200 Subject Electric Eye Plates) || The Twin-Motored Transport Plane || || || 78,434,800 (200 Subject Electric Eye Plates) || The Twin-Motored Transport Plane || || || 42,359,850 (200 Subject Electric Eye Plates) || The Twin-Motored Transport Plane || || || 59,880,850 (200 Subject Electric Eye Plates) || The Twin-Motored Transport Plane || 22779 || || 11,160,600 (400 Subject Electric Eye Plates) || DC-4 Skymaster || 23486, 23588, 23973, 25422 || || 971,903,700 (200 Subject Electric Eye Plates) || Martin 2-0-2 over Pan American Union Building, Wash. D.C. || 23694 || || 207,976,550 (200 Subject Electric Eye Plates) || Lockheed Constellation over New York Skyline || 23683 || || 756,186,350 (200 Subject Electric Eye Plates) || Stratocruiser over the San Francisco Oakland Bay Bridge || 25615 || || 132,956,100 Reference:

1950–1959

1960–1969

Number issued: 39,960,000 || 26630 || 400 Subjects || Jetliner Over Capitol Building || – Booklet Pane of 5 + Label 28024 || (Perforated 10 Horizontally) || Jetliner Over Capitol Building || || Number issued: 42,245,000 Design: Robert J. Jones || 27466 || Design: V. S. McCloskey || 27390 || Number issued: 63,890,000 Design: Robert J. Jones || 27548 || Number issued: 62,255,000 || 27861 || Number issued: 55,710,000 || 29013 || Number issued: more than 50 million || 29087 || Number issued: 152,364,800 Design: Paul Calle || – red omitted – tagging omitted 31378 ||

1970–1979

1980–1989

(1980) – perf 10 1/2x11 1/2 ||

1990–2012

S1111 LL – Perf 11.2 S2222 LR || – die cutting omitted error B1111 UR || – 2001 year date, overall tagging, die cut 11.5 x 11.9 (B2222 UR) – 2005 year date (S1111 UR) – Acadia error, printed on the backing paper (S1111 LR) ||

Notes on types