Helios Airways Flight 522 was a scheduled Helios Airways passenger flight that crashed into a mountain on 14 August 2005 at 12:04 pm EEST, north of Marathon and Varnavas, Greece, while flying from Larnaca, Cyprus, to Athens, Greece. A lack of oxygen incapacitated the crew, leading to the aircraft's eventual crash after running out of fuel. Rescue teams located the wreckage near the community of Grammatiko, 40 km (25 mi) from Athens. All 115 passengers and six crew on board the aircraft were killed.
With 121 fatalities, this was the deadliest aviation accident in Greek history. Flight 522's loss marked the 69th crash of a Boeing 737 since it was brought into service in 1968. The crash is the fourth-deadliest involving a 737-300.
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