Track
One should never speak for other people, but I think I would be correct in saying that anyone who had anything to do with the Tristar thought it was PFM. It was years ahead of it's time and the A/P was far more sophisticated than anything else of that era. A senior pilot at my previous employer used to recount the tale of a duty day doing LHR - CDG twice, back to back and the only time he saw the ground was taxying in and out at London and Paris. One of the helpful control functions was DLC - Direct Lift Control - where the spoilers worked in conjunction with, but in opposite direction to, the elevators, to provide very accurate glidepath tracking with minimum pitch disturbance. Lovely aircraft !
