Helios Airways Flight 522, en route from Larnaca, Cyprus to Prague, Czech Republic via Athens, crashes in the hills near Grammatiko, Greece, killing 121 passengers and crew.

Helios Airways Flight 522 was a scheduled passenger flight from Larnaca, Cyprus, to Prague, Czech Republic, with a stopover in Athens, Greece, operated by a Boeing 737-300. Shortly after takeoff on 14 August 2005, Nicosia air traffic control (ATC) lost contact with the pilots operating the flight, named Olympia; it eventually crashed near Grammatiko, Greece, killing all 121 passengers and crew on board. It is the deadliest aviation accident in Greek history.

Cyprus, officially the Republic of Cyprus, is an island country in the eastern Mediterranean Sea. Situated in West Asia, its cultural identity and geopolitical orientation are overwhelmingly Southeast European. Cyprus is the third largest and third most populous island in the Mediterranean, after Sicily and Sardinia. It is located southeast of Greece, south of Turkey, west of Syria and Lebanon, northwest of Palestine and Israel, and north of Egypt. Its capital and largest city is Nicosia. Cyprus hosts the British military bases Akrotiri and Dhekelia, whilst the northeast portion of the island is de facto governed by the self-declared Turkish Republic of Northern Cyprus, which is separated from the Republic of Cyprus by the United Nations Buffer Zone.

Grammatiko is a village in East Attica, Greece. Since the 2011 local government reform it is part of the municipality Marathon, of which it is a municipal unit. It is part of the Athens metropolitan area.

August 14 is the 226th day of the year in the Gregorian calendar; 139 days remain until the end of the year.