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).
1960年代中期，随着航空的发展，万国邮联开始推行扩大航空邮件使用规模的政策，并于1970年代中期与国际航空运输协会（IATA）一道提出了空运水陆路邮件的概念。