Under the redispatch program ATC just sees a flight plan to the intended destination. Usually there's a bit of extra fuel in the original load. Twice I've come close to not making it. Once I pointed out we were way above econ speed and once we missed by 200 kg. Called the company and said, "Do you really want us to go to EBF?" They re-re-ran the flight plan and were able to drop the alternate (FAA flag rules allow no alternate if the flight is less than 6 hours and the destination is forecast VFR.)