The NTSB still has to interview the two air traffic controllers on duty when an Air Canada regional jet collided with an airport firetruck at LaGuardia Airport in New York on Sunday, killing the two pilots.
The NTSB says one of the controllers was busy with several jobs at the time of the crash. Also, investigators say the fire truck was not equipped with a transponder that identifies aircraft and vehicles on a tracking system for air traffic controllers. That could mean the radio transmission request by those in the airport fire truck to cross the runway may not have reached the controllers.