Well, not much mileage, but it was several years in C-5 before I flew a leg exceeding the 10.2 hour, Yenisheir to Lajes leg in Hawg.
Back to A/T, the bizjet systems work like the Boeings--they move. The modes are Thrust (idle, if descending, CLB, if climbing) or Speed, if the vertical FD mode selected is Vert Spd or on a VNAV PATH. We have the same "FLC Trap", that is, in THRUST mode in a descent, the throttle setting commanded will be IDLE until reaching an altitude or intercepting a VNAV PATH, when they switch to SPEED and fly the commanded speed by using the throttles. IF altitude is the runway and no path is selected, no power until they see a min speed about 5 KIAS above low speed cue.