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.[3][4] 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,[5] 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.[6][7][8] 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.[9][10]

As of October 2013, the airline operates an all-Embraer 190 fleet.