Chairman Jennifer Homendy said the NTSB is recommending that the Federal Aviation Administration permanently ban helicopter operations near Reagan when runways 15 and 33 are in use.

The NTSB pointed out that the current flight paths of helicopters near Washington-National provide only 75 feet of separation from landing aircraft.

Helicopters should be barred from a four-mile stretch over the Potomac River when flights are landing on Reagan National Airport’s Runway 33, National Transportation Safety Board Chair Jennifer Homendy said as the NTSB unveiled “urgent safety recommendations” after the deadly mid-air collision in January.