Following a deadly mid-air collision near Washington Reagan National Airport, the FAA is reducing hourly flight arrivals to improve safety.

A passenger jet has collided with a helicopter while landing at Ronald Reagan National Airport near Washington. That’s according to the Federal Aviation Administration, which says the collision remains under investigation.

The Army was one of 28 government agencies authorized to fly helicopters near Ronald Reagan National Airport before its Black Hawk helicopter collided with an American Airlines passenger jet last week,