on the air
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on (the) air
Broadcasting live, as on television or radio. Please try to control your language, we can't have any cursing while we're on air. Places, everyone! We're on the air in five, four, three….
on the air
broadcasting (a radio or television program). The radio station came back on the air shortly after the storm. We were on the air for two hours.
on the air
see under off the air.