航こう空くう郵ゆう便びん

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Meanings

1

noun

Refers to mail transported by air. Used in contexts such as postal services, shipping, and correspondence.

navigate, sail, cruise

空empty, sky, void

郵mail, stagecoach stop

便convenience, facility, excrement

船ふな便びん
船便 means surface mail (by ship), which is slower and cheaper than 航空郵便.
エアメール
エアメール is a loanword from English 'airmail' and is used similarly, but 航空郵便 is the more formal Japanese term.

Compound of 航空 (aviation) and 郵便 (mail), literally 'aviation mail'.