Definition of "airwaves"

‘Ham’ amateur radio operators in Tiantongyuan, a community in northern Beijing, are using the airwaves to search for an elderly mum who has been missing for over a week.

2006 August 25, Xubo Jiang, “Amateur radio enthusiasts search for missing mum”, in Beijing Review‎, number 273, page 2, column 1

On Tuesday, Nigel took to the airwaves to say that if the eventual choice was between May’s deal or remain, he wouldn’t campaign or vote – a threat arguably without bite for at least 48% of the country.

2019, Marina Hyde, “Chris Grayling is the Berk du Soleil as Farage maps out a road to nowhere”, in Guardian‎