The National Transportation Safety Board will question witnesses Thursday about air traffic control training and collision avoidance technology, two key parts of the investigation into January’s deadly midair collision at Ronald Reagan Washington National Airport.

Investigators testifying at a hearing into the January's mid-air crash in Washington DC suggest faulty altitude data may have led to a miscalculation.

FILE PHOTO: A crane retrieves part of the wreckage from the Potomac River, in the aftermath of the collision of American Eagle flight 5342 and a Black Hawk helicopter that crashed into the river, by the Ronald Reagan Washington National Airport, in Arlington, Virginia, U.S., February 4, 2025. REUTERS/Eduardo Munoz/File Photo

The NTSB revealed that the Black Hawk helicopter may not have known its true altitude at a hearing. Mom Worried If New Rescue Dog Had ‘Bonded’ With Baby, Then She Caught Them Forensics expert analysis of Jeffrey Epstein jail video contradicts government's claims We Asked Young Men Who Voted For Trump to Grade Him.

The head of the National Transportation Safety Board criticized the Federal Aviation Administration for not “taking ownership” in the deadly collision. ABC’s Sam Sweeney reports the latest.