The  Frontier Airlines MEL Terminal appears to be a source of some misunderstanding, as Frontier Airlines does not currently operate out of Melbourne Airport (MEL) in Australia. The United States-based low-cost airline Frontier Airlines flies mostly in North America. Please specify if you are referring to an airport in Australia other than Melbourne or possibly a different terminal at Melbourne. For general information, Frontier Airlines often uses low-cost carrier terminals at the majority of the airports they serve.