“””The helicopter should therefore have given way to the passenger jet. The crew of the Black Hawk should also have sought permission from ATC to “cross the active”, meaning to fly over the active runway and an imaginary line extended from that runway out to the ATC zone limits.
This is another safety mechanism designed to keep aircraft landing, and other airspace users clear of each other. In the ATC transcripts released so far, no such permission seems to have been given.”””
This is the critical part of this article.
NO SUCH PERMISSION SEEMS TO HAVE BEEN GIVEN
“Pass behind” is permission to pass through the airspace.