Austral Líneas Aéreas Flight 46 was an Argentine scheduled domestic flight from Buenos Aires to Posadas, via Resistencia, that undershot the runway at Libertador General Jose de San Martin Airport in Posadas on June 12, 1988 in conditions of poor visibility. All 22 passengers and crew on board were killed in the crash.
Flight 46, operated by a McDonnell Douglas MD-81, departed Buenos Aires' Aeroparque Jorge Newbery to Resistencia at 7:04 local time, and departed from Resistencia to Posadas at 8:40 after a 20-minute stopover. At 9:09, the crew of Flight 46 made radio contact with Posadas air traffic control, and seven minutes later, the flight was cleared for an approach to Runway 01. Shortly after, the aircraft struck the top of a eucalyptus tree and crashed three kilometres short of the runway. All on board perished.