I am a french ATC working on a so called Free Route project but for the moment it is just a project which creates several new more direct routes. The aim is to allow to embark less fuel than the FPL route because the pilots are always given the more direct route possible by the ATC.
I wonder, is it worth to take more fuel in Dubai when you fly to Europe ?
It is difficult to know how much extra fuel will be consumed but I found that for an E145 15% of the extra fuel will be consumed on a 4 hour flight.
It is difficult to find jet fuel prices at airports.
What are the reasons to take more fuel than needed, is it often done ?