Cielos del Sur S.A., operating as Austral Líneas Aéreas, more commonly known by its shortened name Austral, was a domestic airline of Argentina, the sister company of Aerolíneas Argentinas. It was the second-largest domestic scheduled airline in the country, after Aerolíneas Argentinas. 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. As of October 2013, the airline operated an all-Embraer 190 fleet.