The NTSB issued its preliminary report on the midair collision between a passenger plane and helicopter over Washington, D.C., in January.

More than a month after an American Airlines plane and a Black Hawk helicopter collided near Reagan National Airport (DCA), killing 67 people, officials with the National Transportation Safety Board (NTSB) are calling for immediate changes to helicopter routes around DCA because they said it poses “an intolerable risk to aviation safety.

Federal regulators say there's a "serious safety issue" in the airspace around Reagan National Airport in Washington, D.C. An investigation into the midair collision of a military helicopter and a regional jet in January found there have been many close calls involving planes and helicopters near the airport.