Thanks for the reply SMOC.
Being a 747 may have advantage over other types but sadly as you are normally faster then others types and can possibility slow down late you will always find more scenarios which we requires you to slow down rather then speed up.
With the number of traffic we handled these days and internal procedures we tend to generalize everything, and we may not cater well enough for all the differences between types and airlines.
Example would be sending you right after an A340 going the same route on DEP which means you will get speed restriction for quite a while after departure. Remember that 10NM in trail requirement... we also have users who refuse to speed up below 10000ft... company SOP they say.
In contrast we also have cases with those airbus going to China via BEKOL/DOTMI who are reluctant to speed up too much to trade for climb rate and meet various restrictions...
I understand your reason to speed up during a level restriction to trade speed for climb rate later on... yes we would try to help if possible, however it may not be the solution the controller have in mind to deliver the spacing required.
Having said that doesn't mean we can't do better, I would certainly agree that the more we understand each other's OPS we would be able to deliver more efficient services to the public.
