The Tenerife airport disaster, which killed nearly $600$ people, began when a terrorist's bomb caused officials to divert several large jets scheduled to land at Gran Canaria $($including one owned by KLM and one owned by Pan Am$),$ directing them to the smaller airport at Tenerife, which had just one runway and one taxiway. The lack of space led controllers to park planes on the taxiway, so that it could not be used as a preliminary space to line up planes for departure. In addition, right before the accident, the KLM jet was refueling on the runway itself, both adding weight, which made its liftoff slower, and increasing its flammability. After refueling, the KLM jet was told to taxi up the runway to position itself for takeoff; at this time, a thick fog rolled in$.$ Controllers then told the Pan Am jet to taxi down the runway and turn off at the third exit. Poor communication and low visibility caused the crew to miss this turnoff. Meanwhile, poor communication, in part due to radio interference and poorly observed procedures, led the KLM captain to take off, causing his plane to crash into the Pan Am jet and explode.