noun
SAL mail; Surface Air Lifted
A postal service where mail is transported by surface but given air priority; cheaper than airmail but faster than surface mail.
この荷物はＳＡＬ便で送りました。
I sent this package by SAL mail.
ＳＡＬ便は航空便より安いですが、少し時間がかかります。
SAL mail is cheaper than airmail, but it takes a little longer.
Surface mail; slower and cheaper than SAL mail.
From English 'Surface Air Lifted' (SAL) + 便 (mail service).