The phrase "going the air" is actually spelled "going on the air." The correct pronunciation is [ˈɡoʊɪŋ ɑn ði ɛr], where the stress falls on the second syllable of "going" and the first syllable of "air." The phrase refers to the act of starting a broadcast, such as a radio or television show. It is commonly used in the media industry and can also be used figuratively to mean beginning or starting something publicly.