According to one of the pilots heard on ground control frequency, the DHC-8 came out of Cargo 1, which is adjacent to the threshold of 16L. Very, very short taxi time to 16C, from where he took off. According to my charts, Cargo 1 is controlled by 126.87, which has everything north of taxiway N. That is a lot of apron area (airplanes) to control. It is essentially one half of the passenger terminal and almost all of the cargo areas. Very easy to see how a DHC-8 all the way at the opposite end of where the majority of your movements are occurring could slip out undetected by the ramp controller. And, for all we know, the ramp controller may have attempted to contact him on 126.87. Or the ramp controller may have picked up the phone and informed ground control of the errant aircraft. Not that there was much time to do anything about it.
Last edited by cthruit; 20th Aug 2018 at 21:57.