My pet beef at present is when I see controllers give 250K on descent (ie when flying on IAS not mach number) and the pilot says (at FL370) we can't go that fast, we'll do our best or variations there-of; we get it already! Fly your mach into 250K... purrrrlease! When this happens usually gives us a net present gain of 0 minutes; so vector time it is...
Also the pilots that insist on having a Feeder Fix time vice a speed for descent; it just doesn't always work that way; separation first then sequencing...
and, while I'm here...
We give a feeder fix time and the pilot says 'can't make it'; we say do 250K on descent and we end up speeding them up; cause they will be late...
How does the FMS get the winds?; is it "actuals on climb up"/"forecast BOM product"/"capture when last here" Is any data shared (uploaded) across company fleets/types/frames etc.