A commercial plane with 60 passengers and four crew members on board collided with a military helicopter with a crew of three near Washington, D.C., on Wednesday night.
The directive from the FAA included a sharpened focus on the risks and dangers of the jumble of aircraft sharing the crowded airspace near National Airport.
Police boats combed the banks of the Potomac River on Friday, slowly scanning the shoreline under rainy skies as investigators sought clues into the midair collision that killed 67 people.