Following is an MFR extract from the Commission Staff interview with the Identification Technicians at NEADS. It explains the confusion about a destination of either Los Angeles or Las Vegas. The interview was recorded and the audio file will ultimately be made available by NARA
“They began looking for a Delta 89 (Note: the flight is actually Delta 1989) as another hijack. They found it on the scope and had him as a “confirmed hijack”. They originally believed Delta 89 was on a flight path to Las Vegas, but then realized it was to Los Angeles. They marked it as a “Special” flight for tracking purposes. They informed Cleveland Center of Delta 89’s status and that it was in Cleveland Center. They gave Cleveland Center the information that it was headed to Los Vegas, not Los Angeles. They were informed that it was actually Delta 1989, and they gave Cleveland Major Nasypany’s contact number.”