The National Transportation Safety Board is investigating the incident. Spokesman Eric Weiss says that at their closest point, the two aircraft were flying at the same altitude and were only 950 feet apart laterally.
The Federal Aviation Administration says in a statement that the airliner had descended to 400 feet as it approached the airport. That's when the helicopter, flying lower and ahead of the plane, briefly rose to 400 feet as well.
Weiss said that set off an alarm warning of a potential impending collision aboard the airliner. The airline pilot aborted the landing, circled around and landed safely.
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