What is "school of the air"

n. (context Australia informal English) The correspondence schools catering for the primary and early secondary education of children in remote and outback Australia.

School of the Air is a generic term for correspondence schools catering for the primary and early secondary education of children in remote and outback Australia where some or all classes were traditionally conducted by radio, although this is now being replaced by internet technology. In these areas, the school-age population is too small for a conventional school to be viable .