Federal officials are investigating why two planes got dangerously close on a runway at New York's LaGuardia Airport earlier this month despite the airport being equipped with an advanced surface radar system that's designed to help prevent such close calls.

An air traffic controller had to tell the jet to stop after realizing that the United plane was taxiing on the same runway The planes were reportedly just over a quarter mile apart when the pilot on the Republic jet hit the brakes An investigation has been opened after a Republic Airlines jet had to hit the brakes to avoid a collision with a United Airlines plane at LaGuardia Airport in New York City.