noun
airmail; air service; flight (for mail/goods)
Refers to mail or cargo sent by air, or the air transport service itself. Often used in contexts like 飛行便で送る (send by airmail).
この小包を飛行便で送ってください。
Please send this parcel by airmail.
飛行便なら明日には届きます。
If sent by airmail, it will arrive tomorrow.
船便 means surface mail (by ship), contrasting with 飛行便 (airmail).
Compound of 飛行 (hikō, 'aviation, flight') and 便 (bin, 'mail, service'). The reading ひこうびん follows standard on'yomi.