Two planes narrowly avoided collision during takeoff at Chicago’s Midway International Airport on Tuesday.

A Southwest Airlines flight had been cleared for takeoff when a Delta plane began to roll along an intersecting runway without clearance.

Luckily, an air traffic controller quickly ordered the Delta plane to halt.

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“Stop! Stop!” the air traffic controller can be heard saying in audio from the incident.

The two planes were about 2,000 feet from the intersection when they came to a stop.

The Federal Aviation Administration is now investigating the incident.

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