SATA Air Açores Flight 530M was a Portuguese regional commuter flight operated by SATA Air Açores that connected Ponta Delgada-João Paulo II Airport and Flores Airport, with an intermediary stop at Horta, on 11 December 1999. At 10:20 a.m., the British Aerospace BAe ATP, named Graciosa, while en route to Horta, collided with Pico da Esperança, on the central mountains of the island of São Jorge, resulting in the deaths of all 35 people on board. It is the deadliest aviation accident involving the British Aerospace ATP.