The phrase "while on air" is correct and can be used in written English.
It is typically used in the context of broadcasting, such as on radio or television. Example: "The host took a brief break while on air to gather his thoughts before continuing with the live news broadcast."
Stern was told about Dick's comments by one of his listeners while on air, but wasn't surprised Dick would sink so low.
When I heard of the sudden disappearance of the ERT signal from the screens while on air I was reminded of the military dictatorship.
I had been his back-up for the election results programme – I was assigned by the BBC to help crunch his numbers and speak into his earpiece if he needed information while on air (he didn't).
Suhasini Haidar, a television anchor, is pressed into wearing a sharp tailored blazer while on air; it is a look that is thought to convey a sharp contemporary appearance.
While on air, the signal becomes corrupted with AWGN noise n(t).
Imagine my surprise that Joy was texting away on her Blackberry while on air, and a conversation about a study that showed good friends could help you live to 100 years old immediately brought up Twitter.
One Anonymous member, who agreed to a live radio interview on Thursday with a WBC spokeswoman, spontaneously hacked one of the Church's websites while on-air.
In the breaks between live segments, Jones and Fitzgerald were constantly checking their phones for tweets to quote while on-air.
(Well, really because, supposedly, there was an agreement in place that they wouldn't discuss or even hint to the incident while on-air. XM apparently felt they did).
They were responding to an allegation from the former Radio 1 DJ, Liz Kershaw, who said during that period the station had a "rugby club locker room" culture and that she had been "routinely groped" while on-air.
There were reports of troop defections, tribal leaders turning, and resignations by diplomats (one while on the air with Al Jazeera).
