The Federal Aviation Administration says helicopters will be permanently banned from flying near Washington, D.C.’s airport on the route where an airliner and an Army helicopter collided in midair.

The US Federal Aviation Administration (FAA) has permanently restricted non-essential helicopter operations around Reagan National Airport following a deadly mid-air collision with an American Airlines regional jet in January.

The closure of the helicopter route near the airport makes permanent the restrictions put in place after Jan. 29 midair collision.