Six weeks after 67 people perished in a D.C. midair collision, the NTSB’s preliminary report exposes a history of near misses between commercial jets and helicopters at the airport.

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 National Transportation Safety Board on Tuesday released two reports — one on preliminary findings and another on safety recommendations — related to the deadly collision of an Army Black Hawk helicopter and an American Airlines regional jet in January.