air·mail 
/ˈeɚˌmeɪl/ noun
/ˈeɚˌmeɪl/ noun [noncount] : the system used for sending mail by aircraft
▪ The package was sent by/via airmail. ; also : mail sent by using this system
▪ a bag of airmail — often used before another noun ▪ an airmail letter ▪ airmail postage
▪ The package was sent by/via airmail. ; also : mail sent by using this system
▪ a bag of airmail — often used before another noun ▪ an airmail letter ▪ airmail postage
— airmail verb, airmails; airmailed; airmail·ing [+ obj]
▪ He airmailed the letter/package to me. = He airmailed me the letter/package.
▪ He airmailed the letter/package to me. = He airmailed me the letter/package.
