The National Transportation Safety Board will wrap up its public testimony about the fatal midair crash between an Army helicopter and a commercial jet.

Investigators so far have highlighted several factors that may have contributed to the collision, which left 67 people dead.

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.

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.

An air traffic controller should have warned an American Airlines Group Inc. jet that there was a US Army Black Hawk in the vicinity before the two craft collided midair near Washington in January, a Federal Aviation Administration official said.