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

Citing “intolerable risk for aviation safety,” the National Transportation Safety Board says helicopters should be banned from flying a certain route near Washington if two specific runways are in use.

The National Transportation Safety Board is calling for a ban on some helicopter flights near Reagan Airport after an airliner and Army Black Hawk collided in January.