Surface Air Lifted

Surface Air Lifted (SAL) is a postal service used to send international mail items.

At first SAL mail is processed and transported by surface in the origin country.

[4] Prior to World War II a number of European countries adopted the practice of forwarding letters to distant destinations at no extra cost to the sender (such as British mail sent to most parts of the British Empire).

The consistently high costs of air mail curtailed this trend after the war.

During the mid-1960s in response to the continuing increase of aircraft capacity, the UPU adopted the policy of maximizing air conveyance of mail and in the mid-1970s the concept of “surface air lifted” mail was developed in conjunction with the International Air Transport Association (IATA).