Helios Airways Flight 522 took off from Larnaca Airport, Cyprus, on August 14, 2005, bound for Athens and Prague, carrying 115 passengers and six crew members. Less than an hour into the flight, communication with the pilot was lost, and the aircraft continued to fly on autopilot. Greek military fighter jets were dispatched when the plane entered Greek airspace without any contact with air traffic control. Upon investigation, it was discovered that the co-pilot had slumped over the controls, and oxygen masks were hanging in the cabin, indicating a loss of cabin pressure. This loss was attributed to the pressurization system being set to manual instead of automatic during maintenance prior to takeoff. As the aircraft ascended, oxygen levels dropped, leading to hypoxia among the crew and passengers. The plane continued to fly for about two hours until it ran out of fuel, resulting in a crash near Grammatiko, north of Athens, claiming the lives of all 121 individuals on board. The incident, dubbed the 'Ghost Flight,' led to a thorough investigation into cockpit safety protocols and alarm systems, revealing critical flaws that needed addressing.