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.