Routechecker,thanks for the advice which I accept but it is also important to consider the practical and economical aspect of rerouting from the operators point of view.
For instance in major uk airports in a non tankering situation it can take up to 1 hour just to get a bowser back to an a/c for the 1000kgs you mention, by which time you may as well sit with the original delay and have a much shorter flight time, as well as make a saving on fuel costs.
This type of scenario may be the cause of increased cheating from operators as options become more limited.
I do not advocate cheating as a solution, I just wanted to emphasise the increasing complexity of achieving an effective reroute from congested airports into ever restrictive airspace.
