Austral Líneas Aéreas Flight 2553 was an Argentinian domestic scheduled passenger flight from Posadas to Buenos Aires. On October 10, 1997, the McDonnell Douglas DC-9-32 that was operating the flight crashed on the lands of Estancia Magallanes, Nuevo Berlín, 32 kilometres away from Fray Bentos, Uruguay. All 74 passengers and crew died upon impact. The accident remains the deadliest in Uruguayan history.

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 shared its headquarters with that airline, which is located in the Aeroparque Jorge Newbery of Buenos Aires, the main base of operations of the company.