Maestro, the tool the airlines asked for. A slight digression if I may...
There has been recent complaints about aircraft in the hold being allowed to track and speed as desired in the pattern to meet a feeder fix time. No Stack Departure time. We realize that this is harder to do with the little boxes, but feeder fixes require you to be at the fix at the time specified. A stack departure time allows you to be a minute early or 30 seconds late out of the hold. If two aircraft in a row are at these extremes then we either get two at the fix at the same time or at the other extreme, a slot disappers and everyone gets pushed back again.
The airlines asked for this system. We all have to work with it.
Cheers,
R-s.