Originally Posted by QueenOfCoach

Either way, he will emerge from TSA at the beginning of the T4 concourse departures level. He should walk towards the end of the concourse looking for "Gate 44". That is the place where he gets on an airside bus to the Eagles Nest. There is ample signage directing the passenger. He will go down a short escalator, the follow the signs.

Gate 44 is not an airplane jetbridge gate, but just a bus pick up and drop off point, like FCC in LHR. Eagles Nest gates used to be numbered 44A, 44B, etc, but they were changed recently to 60A, 60B, etc. Once Dad arrives at the Eagles Nest, he should look at a monitor to determine which gate is his.

Having said all that, Dad should double-check his gate while still in T4, on the off chance the flight leaves from T4 or T6 and not the Eagles Nest. If the flight leaves from T6, he would still get the airside bus.

I would always prefer going through TSA in T4 instead of TBIT, even without Priority Access.