The National Transportation Safety Board is expected to release its preliminary report today on the mid-air collision between a regional jet and a military helicopter on January 29 near Washington, DC.

Helicopters should not be allowed to travel over a four-mile stretch over the Potomac River following the deadly air collision near Washington in January, according to urgent safety

The National Transportation Safety Board uncovered more than 15,000 “near-miss events” between helicopters and jets at Reagan National airport in just three years leading up to the American Airlines jet and Army helicopter collision that killed 67 people.