Out of all the accident animations I upload, I've never seen something far worse than runway incursions; incidents of which a plane narrowly misses colliding with another plane on the runway. Despite extensive training and heightened awareness, runway incursions—defined as any vehicle on a runway when it shouldn't be—occur in the U.S. with surprising regularity. We're seeing something like 325 of them a year. That's too many. The possibilities are too great for a collision, for an accident where many deaths could be a result. Of these, as many as 25 each year are considered extremely serious. An almost exact repeat of the Tenerife disaster took place in 1999, at Chicago's O'Hare airport. The National Transportation Safety Board produced an animation which shows a Korea Air 747 being forced to climb over a China Air 747 that had blundered onto the runway. The two planes missed each other by only 80 feet.And another, even more recently: in 2005, in Boston, an air traffic controller cleared a US Airways jet for takeoff. But at the same time another controller cleared an Aer Lingus flight to take off on a crossing runway. At the last minute, the US Airways co-pilot spotted the other plane and warned the captain who delayed his takeoff as long as he could, allowing the Aer Lingus to slip overhead.Had the co-pilot not felt free to speak up, hundreds of people could have died. Airlines, today, extensively train pilots in simulators, not only to perform emergency maneuvers, but to condition behavior as well.This one took place at LAX Airport on August 19, 2004, at 1455 Pacific daylight time ( 2:55PM), Asiana Airlines flight 204 (AAR204), a Boeing 747-400, and Southwest Airlines flight 440 (SWA440), a Boeing 737, were involved in a near collision on runway 24L at LAX Airport in Los Angeles, California. No injuries were reported, and neither aircraft was damaged. The same tower controller cleared AAR204 to land on runway 24L and cleared SWA440 onto the same runway to depart. AAR204 initiated a go-around and flew over SWA440 by about 200 feet. The incident occurred during daylight visual meteorological conditions. The worst runway incursion; of course WAS Tenerife; a small island located on the Canary Islands. No use of radar, dense fog and poor communication between pilots and air traffic control caused two Boeing 747s, Pan Am Flight 1736 and KLM Flight 4805 to collide on the runway at Tenerife, Canary Islands. Both aircraft then burst into flames, killing 583 people.Pan Am 1736; the Clipper Victor (which was the first Boeing 747 to have a commercially scheduled flight in 1970) was operating as a charter flight from Los Angeles to New York and Las Palmas in the Canary Islands when it was diverted to Tenerife due to a bomb scare at Las Palmas. The KLM 747; heading for taking off without permission collided with it on the runway. A total of 583 people were killed, 335 of them from the Pan Am plane. The accident led to reforms including improvements in communications between flight crews and ground control.

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