The plural of airtime; periods when a radio or television program is broadcasting, or the length of time during which a program airs.
From 'air' (the medium) plus 'time,' becoming a compound noun in radio and broadcasting around the 1920s-1930s when these media became prominent.
In the early days of radio, 'airtime' was incredibly expensive—a 30-second ad slot could cost thousands of dollars, making 'airtimes' a highly prized and carefully scheduled commodity that determined which voices reached millions.
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