エアメール (eamēru) means “air mail”

More examples

エアメールの料金を調べます。e a mē ru no ryō kin o shira be ma su

I check the air mail postage.

Describes mail that travels by aircraft rather than only by land or sea.

航空郵便kōkūyūbin: A formal postal term for mail sent by air.

航空機を利用して手紙や荷物を送る郵便。kō kū ki o ri yō shi te te gami ya ni motsu o oku ru yū bin

It is a Japanese loanword from English airmail, formed from air and mail.

In English, airmail is commonly written as one word and can refer to both the service and the mail sent by air.