In an email reported by Politico , Chris Senn, Federal Aviation Administration, said the Army helicopter "took a scenic route around the Pentagon versus proceeding directly from the west to the heliport."
Senn said the helicopter violated safety standards and required air traffic controllers to order two commercial jetliners to perform "go-around maneuvers," aborting their landzings and returning on another approach.
Delta plane and an Air Force jet outside Washington triggered a collision warning and "corrective instructions" from air traffic controllers.