An American Airlines passenger jet and an Army helicopter collided on Jan. 29 as the plane prepared to land at Washington, D.C.’s Ronald Reagan National Airport.

The NTSB’s preliminary report on the Jan. 29 crash that killed 67 people said current helicopter routes allowed around the airport are an ‘intolerable risk to aviation safety.’

After discovering a dangerous trend of near misses, the NTSB is recommending a ban on certain helicopter flights near Reagan National Airport in Washington, D.C. The urgent safety action comes in response to the deadly midair crash between a military chopper and a passenger plane over the Potomac River on Jan.