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.

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