The National Transportation Safety Board (NTSB) is meeting Friday for its final day of hearings looking into the January crash between an Army helicopter and American Airlines plane near Washington, D.C., which killed all 67 people onboard both aircraft.

New details have emerged since the NTSB launched its probe, including documents suggesting the Army Black Hawk helicopter may have been relying on inaccurate readings during its training flight. This could explain why the chopper was flying higher than it should have been over the Potomac River in the lead-up to the mid-air collision near Reagan Washington National Airport.

The collision marked one of the deadliest aviation incidents since the 9/11 attacks.

The final day of hearings will focus on technology, safety data systems across the aviation sector and closing remarks, according to the website.

The event is scheduled to begin at 9 a.m. EDT.

Watch the live video above.