Air traffic control audio obtained by the
New York Post indicated the United flight got close enough to the Black Hawk to set off an anti-collision warning, or "resolution advisory," from its traffic avoidance system.
The alert suggests a potential crash was only seconds away.
"United 589, just want to clarify here, did you get, uh … just a traffic call reference to the helicopter or did they restrict your altitude or anything," the controller reportedly asked the United flight.
"We had a resolution advisory for United 589, RA," a pilot replied.
"We’re gonna be addressing that because that was not good," the controller said.