action is taking place with changes on the routes :
The FAA has made significant changes to helicopter flight zones south of the airport, effective June 12. They are now restricted from flying over a large portion of the Potomac River and have been moved further away from fixed wing arrival and departure paths. There’s a new route called the ‘Broad Creek Transition’ which provides greater vertical separation for heli transits south of the field. It is the latest in a series of safety improvements since January’s tragic collision.
(source Ops group Briefing ).