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 Federal Aviation Administration has imposed permanent restrictions on non-essential helicopter operations around the Washington, D.C., airport where an Army chopper collided with a commercial jet

There's an "intolerable risk to aviation safety" with helicopters and planes flying too close to one another near DCA.