Cielos del Sur S.A., operating as Austral Líneas Aéreas, more commonly known by its shortened name Austral, is a domestic airline of Argentina, the sister company of Aerolíneas Argentinas. It is the second largest domestic scheduled airline in the country, after Aerolíneas Argentinas itself. As a subsidiary of Aerolíneas Argentinas, the company shares its headquarters with that airline, which is located in the Aeroparque Jorge Newbery of Buenos Aires, the main base of operations of the company.
Austral is currently fully integrated into Aerolíneas Argentinas; however, some differences arise, especially those relying upon the unions the staff of both companies are affiliated to, which lead to constant conflicts. In May 2020 it was announced that Austral would merge with Aerolíneas, saving an estimate of 100 millon US Dollars and leading to the disappearance of Austral as a brand.