The goggles were discussed Friday at the NTSB’s third and final day of public testimony over the fatal midair crash, which killed 67 people.

On the eve of the investigative hearings, Republican Sen. Ted Cruz introduced legislation called "The Rotor Act," which would require all aircraft, including military, to transmit ADSB location when flying -- a system that allows aircraft to transmit its location to other aircraft as well as to air traffic controllers.

The Federal Aviation Administration said on Friday it is planning additional helicopter route changes near Ronald Reagan Washington National Airport after the January 29 mid-air collision of an American Airlines regional jet and an Army helicopter that killed 67 people.

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