Another Near Miss Mid-Air Plane Crash

Disaster averted when two planes were just 400 feet apart and seconds from colliding.
2:02 | 05/23/14

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Transcript for Another Near Miss Mid-Air Plane Crash
rain could be on the way. And now the investigation involving that near-miss. Two planes just hundreds of feet apart. Here's David Kerley. Reporter: The close call on a Friday evening, two united jets lined up on separate runways, when an air traffic controller, being trained, sends the first a-320 off to Vancouver, but he makes a mistake. Unid 601, thank you. Turn right. Right turn heading 340. 340 runway Niner, clear for takeoff. Reporter: The pilot is told to turn right, when it should have been a left turn. 45 seconds later, that second united jet, headed to Mexico City, cleared for takeoff. The two aircraft carrying 225 people in total, are headed right for each other, and the tower controller. United 601, what's your heading there -- Reporter: Realizes something is wrong. The jets are now just 4,300 feet from each other. One just 400 feet higher than the other, seconds from possible disaster. ,Nited 601, stop your turn, stop your climb and stop your turn. United 601. Reporter: Several minutes later, the pilot of the first aircraft asks another controller what happened. How close did they get? Y'all basically crossed directly over the top of each other. But you know, it was pretty gnarly looking. I'm guessing he was supposed to give us a left turn? That would be, that would be my guess.fá Reporter: This was two weeks ago. Just 16 days earlier, that close call in Newark. A Kay a later, two jets had to avoid each other in Hawaii. Many of this country's air traffic controllers are retiring, and we're seeing a lot of training. And those passengers didn't know how close the aircraft got. Thanks.

This transcript has been automatically generated and may not be 100% accurate.

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