SOME Airtrafficers need to learn a little bit about aerodynamics w.r.t flap!
Asking a heavy weight A340 (ex UK/Eur to the Far East) to "expedite" when it still has flap out is pointless!
The subtile difference between Best Angle and Best Rate seems lost on many.
We are forever telling ATC that we cant - and boy do they get shirty!! The toys come right out of the cot........
FYI: The only thing we can do is....lower the nose, accelerate, retract the flap and then start climbing again (at a better rate!)
Ive given up trying explain.....just give me the vectors!