Air on tubes is a term used to describe the process of telecasting. Telecasting is the transmission of audio and video signals over a distance, usually through cables or radio waves. It is commonly used for broadcasting television programs, but can also be used for other forms of communication such as telephone calls and internet streaming. Air on tubes is a term used to describe the process of transmitting audio and video signals through air-filled tubes, which are often used in large-scale broadcasting operations.