On the air refers to the status of being broadcasted live on radio or television. Some synonyms for the phrase include "live on air," "broadcasting," and "airing." Other related terms that can be used in place of "on the air" include "streaming," "transmitting," "telecasting," and "webcasting." These terms are often used interchangeably to describe the act of delivering content through a variety of mediums and platforms. Whether it's a TV show, radio program, or online webinar, these synonyms for "on the air" are useful for conveying the idea of real-time, live delivery to an audience.