Air letters are popular and the annual user is some 40 million a year.
Pre-printed aerogrammes forms (or air letter as they were inscribed), with a 4 piastre stamp affixed, were first made available in 1944.
The rates of postage on air letters are so fixed as to cover as nearly as possible the cost of transport and of handling and similar operations in this country.
Normally the opportunities for the despatch of airgraphs are more frequent than in the case of air letters.
Owing to the need for processing airgraphs, they take about four days longer on the average than air letters to reach their destination.
There has been no change in the conveyance rate paid to airlines for the conveyance of air letters or of any other type of airmail.
Thereafter, the term "air letter" quickly faded from use.
From 1933 to 1948, mandate services included airmail stamps and, as an innovation, "air letter cards".
