During the war, the British Post Office introduced the British Airgraph Service for messaged between servicemen and civilians. Each message was written onto a special form that was given an id number and photographed onto microfilm. The microfilm was flown to its designation, developed back into a half size print and posted to the recipient. This process was later adopted by the Americans, and renamed “Victory Mail” or V-mail.
It’s estimated that 1600 airgraphs (or v-mails) on microfilm weighted 5oz verses 50lbs for traditional letters. It’s estimated that the British Empire alone sent 135,224, 250 air graphs.