Origin of AIR
Middle English, from Anglo-French, from Latin aer, from Greek aēr
First Known Use: 14th century

Origin of BE
Middle English, from Old English bēon; akin to Old High German bim am, Latin fui I have been, futurus about to be, fieri to become, be done, Greek phynai to be born, be by nature, phyein to produce
First Known Use: before 12th century