In 2005, Helios flight 522 from Cyprus lost cabin pressure while travelling to Prague. A lack of oxygen knocked the pilot and co-pilot unconscious, leading to the ‘ghost plane’ crashing into the hills near Athens, killing all 121 people on board. This accident made the EU tighten air safety protocols. Today, European skies are among the safest in the world. Learn how air safety experts, inspectors and air traffic controllers work together to put EU air safety standards into practice