NTSB spokeswoman Sarah Sulick told CNN interviews related to the investigation are ongoing, a detail that has not yet been reported elsewhere. Investigators will be able to listen to the radio transmissions, which have already been recorded and preserved. Those recordings would also reveal if the American pilots heard the instructions completely from the air traffic controllers and if so, how they apparently became confused. If the voice records inside the American cockpit are preserved, they may depict a detailed conversation about the aircraft’s on-the-ground movements. In this incident, radio recordings show controllers instructed the American pilots to place a phone call to officials at the tower to address the “possible pilot deviation” from the assigned route.

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