airlift (n.)

c. 1300, "invisible gases that surround the earth," from Old French air "atmosphere, breeze, weather" (12c.), from Latin aer "air, lower atmosphere, sky," from Greek aēr (genitive aeros) "mist, haze, clouds," later "atmosphere" (perhaps related to aenai "to blow, breathe"), which is of unknown origin. It is possibly from a PIE *awer- and thus related to aeirein "to raise" and arteria "windpipe, artery" (see aorta) on notion of "lifting, suspended, that which rises," but this has phonetic difficulties.

In Homer mostly "thick air, mist;" later "air" as one of the four elements. Words for "air" in Indo-European languages tend to be associated with wind, brightness, sky. In English, air replaced native lyft, luft (see loft (n.)). In old chemistry, air (with a qualifying adjective) was used of any gas.

To be in the air "in general awareness" is from 1875; up in the air "uncertain, doubtful" is from 1752. To build castles in the air "entertain visionary schemes that have no practical foundation" is from 1590s (in 17c. English had airmonger "one preoccupied with visionary projects"). Broadcasting sense (as in on the air, airplay) is by 1927. To give (someone) the air "dismiss" is from 1900. Air pollution is attested by 1870. Air guitar is by 1983. Air traffic controller is from 1956.

mid-14c., "a man's load, as much as a man can carry;" late 15c., "act or action of lifting," from lift (v.). Figurative use from 1620s. Meaning "act of helping" is 1630s; that of "cheering influence" is from 1861. Sense of "elevator, hoisting machine to raise or lower between floors of a building" is from 1851; that of "upward force of an aircraft" is from 1902. Meaning "help given to a pedestrian by taking him along his way in a vehicle" is from 1712. As a dance move, from 1921. Sense of "heel-lift in a boot or shoe" is from 1670s.

The word once had a twin, Middle English lift "the air, the atmosphere; the sky, the firmament," from Old English lyft "air" (see loft (n.)).