Title: History of the British Army postal service
Content: Airways seaplanes and military transport. The postage on each air letter was three pence (3d) and, due to limited air capacity, they were initially rationed at one per man per month but towards the end of the war, as more capacity became available, the ration was lifted. The private nature of the air letter ensured its popularity among its users and that popularity, with its lightness, brought about its continued use as today's civilian air letter (aerogrammes) and the military "bluey". The APS was not involved in the initial planning stages of Operation Torch, the 1942 Anglo-American invasion of North

Title: Airmail stamp
Content: carried mail, to which stamp-like labels were affixed. At the beginning airmail letters cost more than surface mail. Both airmail stamps and stamps surcharged for airmail were issued, though some countries restricted the use of airmail stamps only to letters sent by airmail, while others allowed them to be used for other mail services. The first stamp depicting an aeroplane was a US 20-cent parcel post stamp issued on 1 January 1913 but not intended for airmail duty: the set of 12 showed transportation and delivery methods. Four years later an airmail stamp was issued in Italy. Several of the

Title: Airmails of the United States
Content: with disastrous results — when all CAM contracts were summarily cancelled by President Franklin D. Roosevelt owing to the Air Mail Scandal. Domestic air mail became obsolete in 1975, and international air mail in 1995, as distinct extra fee services when the USPS began transporting all First Class long distance intercity mail by air on a routine basis. During the first aerial flight in North America by balloon on January 9, 1793, from Philadelphia to Deptford, New Jersey, Jean-Pierre Blanchard carried a personal letter from George Washington to be delivered to the owner of whatever property Blanchard happened to land

Title: Airmails of the United States
Content: be serviced by air, the legend "AIR MAIL" did not appear on any USPOD stamp until eight years later when the 10-cent C-7 rectangular was issued on February 13, 1926, two days before the first ever mail flight under contract with a commercial carrier was made on February 15, an eastbound trip between Detroit and Cleveland over CAM Route 7. Scheduled Transcontinental Air Mail service flown between New York (Hazelhurst Field, L.I.) and San Francisco (Marina Field ) began on September 8, 1920, over a route laid out in July and August by Eddie Rickenbacker and Bert Acosta who had

Title: Airmails of the United States
Content: helped pilot the first experimental through flight carrying about 100 letters which landed at Durant Field located at 82nd Ave and E. 14th St. in East Oakland. The transcontinental mails were originally flown only during daylight hours while being entrained at night, although on February 22, 1921, a nighttime leg on this route (Omaha to Chicago) was flown for the first time with Jack Knight as the pilot. The first daily Transcontinental Air Mail service involving both day and night flying over the entire route was opened on July 1, 1924, which reduced the time of the trip from more

Question: In which decade of this century were airmail letters first carried?
Answer: 2nd decade