1941 6¢ Twin-Motor Transport
US #C25 – 5,746,527,700 were issued
1943 6¢ Transport Plane,bklt pane (3)
US #C25a – Booklet stamp issued on March 18, 1943

On June 25, 1941, the US Post Office Department issued the first in a new series of Airmail stamps picturing a twin-motored transport plane.

Planning for these stamps dates back to 1936. A uniform series of different denominations would cover, singly or in combination, all airmail postage requirements – a neat, practical replacement for stamps issued at various intervals since 1928 that had different sizes, shapes, and designs. The Post Office hoped to make a new series of stamps that was more consistent.

The new series of stamps all featured the same design, differing only in color and denomination. The Post Office felt having the same picture on all airmail stamps would help customers identify them as airmail stamps and the different colors would help distinguish the denominations.  They were all perforated 11 x 10½, with the exception of the booklet pane, which was perforated 11. These stamps were intended to cover the various rates in effect for both domestic and overseas airmail service.

1941-44 Twin-Motored Transport Plane Issue
US #C25-31 – Get the complete set in one convenient order.

The plane on the stamps isn’t a real plane, rather the post office described it as “a representation of a modern transport plane in flight. The stamp’s artist likely took inspiration from the Douglas DC-3, Lockheed Electra, and Beech 18.

The first stamp in the series, the 6¢ carmine, covered domestic airmail service and was issued on June 25, 1941, in Washington, DC.

1941 10¢ Twin-Motor Transport
US #C27 – 67,117,400 were issued

The second stamp, the 10¢ violet, covered airmail service to areas in the West Indies, as well as Central and South America. It was first issued on August 15, 1941, in Atlantic City, New Jersey.

1941 15¢ Twin-Motored Transport
US #C28 – 78,434,800 were issued
1941 15¢ Twin-Motored Transport Classic First Day Cover
US #C28 – Classic First Day Cover

The third stamp, the 15¢ brown carmine, was also used for airmail service to areas in the West Indies as well as Central and South America. On August 19,1941, this stamp was first issued in Baltimore, Maryland.

1941 20¢ Twin-Motored Transport
US #C29 – 42,359,850 were issued

The fourth stamp, the 20¢ bright green, replaced US #C21, covering the rate for trans-oceanic airmail.  First issued in Philadelphia, PA, this stamp was available on August 27, 1941.

1941 30¢ Twin-Motored Transport
US #C30 – 59,880,850 were issued

The fifth stamp, the 30¢ blue, was also used on trans-oceanic airmail. Kansas City, Missouri was the place of first issue on September 25, 2941.

1941 50¢ Twin-Motored Transport
US #C31 – 11,160,600 were issued

The sixth stamp, the 50¢ orange, replaced US #C22, for use on trans-Pacific airmail.  On October 29, 1941, this stamp was issued in St. Louis, Missouri.

1944 8¢ Twin-Motored Transport
US #C26 – 1,744,878,650 were issued

The final stamp in the series, the 8¢ olive green, was issued in 1944 to meet the increased postage rates put into effect to help finance World War II.  It was first issued on March 21, 1944, at Washington, DC.

1943 6¢ Transport Plane,bklt pane (3)
US #BKC3 – 6¢ Transport Plane booklet pane

These stamps remained in use until October 1, 1946, when the domestic airmail rate was reduced to 5¢ per ounce, and a new series featuring the DC-4 Skymaster was issued.

FREE printable This Day in History album pages
Download a PDF of today’s article.
Get a binder or other supplies to create your This Day in History album.

Discover what else happened on This Day in History.

Did you like this article? Click here to rate:
4.9/5 - (15 votes)
Share this Article



  2. You have 2 “AIR 8 MAIL” pictured and did not print a picture of the “AIR 10 MAIL” with the explanation of the “C27 67,117,400 issued” in the PDF download. Honest mistake. Love your articles. Mary V

  3. I really think this is a neat set, and it is interesting that is not an actually an airplane that was in service. Maybe it would have been a great engineering accomplishment. It is also interesting that a few were cancelled RF for the Republic of France. I found one in a mix once, but it could well be a forgery.

Leave a Reply

Your email address will not be published. Required fields are marked *