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Adjective: on-air  ,ón'ehr
  1. Being broadcast on radio or television
    "The show goes live with its on-air debut"
Adverb: on air
  1. In a state of extreme happiness or elation
    "the newlyweds were on air after the ceremony"
     
  2. Actively broadcasting or recording
    "The red light means we're on air"

Encyclopedia: On-air

On air, on sale