Transcript for Chaos in the cockpit at JFK Airport
Back hear at home to the near disaster on the runway at you're about to hear a stunning exchange between a controller and a delta pilot last night at a very busy travel time. Here's janai Norman. Reporter: Tonight the FAA investigating a tense moment on the runway at one of the nation's busiest airports. Delta airlines flight 300 had just landed at JFK last night and was taxiing to its gate as delta flight 253 was beginning to take off. Cleared for takeoff, Clear, takeoff. Reporter: Delta 300 crosses onto the runway. Delta! Delta 300! Delta 253 is aborting takeoff. Reporter: The departing flight narrowly avoiding collision with the other 757 that was blocking the runway after the pilot apparently became confused and thought he was clear to cross. Delta 300, you were instructed to hold short of runway 22 right? You said cleared to cross and I repeated back, I thought that's what you said. I said hold short of 22 right and I asked you for your gate number, but -- Well, that's my fault. I just heard what you said and repeated back the wrong thing. Reporter: The close call similar to this near disaster in San Francisco back in July 2017. An air Canada flight mistakenly lined up on the taxiway. Air Canada flew directly over us. Yeah, I saw that guys. Reporter: Landing within 30 to 50 feet of a united 787, putting up to 1,000 passengers at risk. Runway incursions are rare. There were only two serious commercial incidents in all of 2019 according to the FAA. Delta released a statement saying they are investigating this incident. Tom? Janai, thank you.
This transcript has been automatically generated and may not be 100% accurate.