The National Transportation Safety Board said the separation between helicopters and jets in the area was insufficient and increased “chances of a midair collision.”

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.

Helicopter traffic should be permanently banned near Ronald Reagan Washington National Airport during certain periods to alleviate congestion and avoid a repeat of the deadly midair collision that occurred there in January,