To hopefully provide a little more info for Nautilus and Transition Layer from an F100 pilots point of view-
We have a very wide speed range in the cruise and can slow down considerably more than the Boeings. We can do anywhere from M0.60 to M0.76 in the cruise so if ATC give us a Julim time the first thing we do is slow down the cruise and leave the descent as profile (normally 0.72/270). Only if at min cruise speed we still cannot meet the Julim time will we then slow the descent profile.
I think Nautilus hit the nail on the head, we loose the time in cruise and you (Transition Layer) are loosing it on descent so we end up with problems!
Ranmar850- Its good to see you have grasp of what is going on with the West Angelas departures, we often think that you guys must think we are just trying to upset you but its far from the case! Often our COBT at West Angelas is after last light and we cannot depart out of there after dark (as you pointed out) so we hold off as long as we can before taking off but as we are early on our COBT we still cop slow downs as soon as we get airborne.