surface air-lifted mail

Also known as: SAL

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In postal system: Development of airmail
…mid-1970s, the concept of “surface air-lifted” (SAL) mails was developed in conjunction with the International Air Transport Association (IATA). This arrangement allows some mails to receive, for little or no surcharge, speedier transmission than by surface, but without the priority of fully surcharged mails. Use of SAL varies from…
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