Originally Posted by SchmeckFlyer
Fuel also does not cost the same all over the world, and presumably, BA must refuel their birds not just in the UK. SAA, for example, fills its daily 747 to Lagos from JNB with enough fuel so as not to have to take on fuel in Nigeria, where it seems to be very expensive (despite being a lrge producer). I imagine BA factors in fuel prices at all its destinations...
BA do normally refuel in the turnaround but some they do use a method called 'fuel tankering' to some destinations (can't remember which but I can find out if you want me to) where they load up with fuel for both legs in London because the fuel cost at the destination is so high.