The phrase "air mail" refers to a method of sending letters or packages by airplane instead of traditional mail services. It's a faster way of delivering items across long distances. Full definition
If in 1990s Russian dating sites were selling addresses of women (to send a letter by air mail). (blogs.elenasmodels.com)
Should i go for that method or registered air mail? (gogi.in)
The recycling program is a nationwide project available not only where there are drop - off points, but everywhere you can send air mail. (goodcleantech.pcmag.com)