On March 27, 1977, at Los Rodeos airport in Tenerife, Pan Am Flight 1736 was sitting on the taxiway waiting to take off. A thick fog obscured the approach of KLM 4805, as it bore directly towards them. Air Disasters: Disaster at Tenerife airs tonight at 10 PM. | Smithsonian Channel Aviation Nation

Deadliest Aviation Accident Ever - The Tenerife Airport Disaster The accident took place on March 27, 1977, when two Boeing 747 passenger jets collided on the runway of Tenerife North Airport on the island of Tenerife. KLM flight 4805 started its takeoff run during in dense fog, unaware that Pan Am Flight 1736 was still on the runway. The impact and resulting fire killed all 248 people onboard the KM plane and 335 of 396 people onbaord the Pan Am plane. To this day, it is the deadliest disaster