WASHINGTON—Two airborne planes—one landing and the other taking off—came within a half-mile of colliding at John F. Kennedy International Airport on Friday in the second such incident at the airport in a week, the Federal Aviation Administration said. The FAA moved quickly to change takeoff and landing procedures at JFK on perpendicular runways—the kind of runways involved in both incidents. FAA spokeswoman Laura Brown said a Delta Flight 123 was arriving at the airport Friday when the pilot decided to abort his landing and execute a “go-around”—a routine procedure often used during heavy congestion. That caused the Delta flight to intersect with the flight path of Comair Flight 1520, a regional jet that was taking off on another runway.

The FAA ordered new procedures Friday afternoon to change the way takeoffs and landings on perpendicular runways are sequenced, Brown said in an interview with The Associated Press. The new procedures are designed to ensure “that aircraft of one runway clear out of the path of the other runway before the second flight comes down on the other runway,” Brown said. “We’ve had two events recently and I think we want to make sure the appropriate safety margins are in place.” Last Saturday, a Cayman Airways flight was landing at JFK when the pilot decided to abort the landing a fly around the airport again as a LAN Chile jet was taking off. Their flight paths crossed, bringing the planes within about 200 feet of each other vertically and a half-mile horizontally. On Friday, the Delta jet, a Boeing 757, and the Comair plane, a Bombardier CRJ9, came within 600 feet of each other vertically and a half-mile horizontally, the FAA said.

The agency said it was not classifying either incident as a “near collision” because there was no violation of standards for how apart planes can fly, Brown said.

Dean Iacopelli, a representative for the New York National Air Traffic Controllers Association, said the FAA has “terminated that perpendicular simultaneous approach procedure.”