Ok, thought that is what you meant. So, if I book a flight for example with 2 sectors on BA, 2 on AA and 2 on Qantas, are you saying that the fuel surcharges will depend on which airline I actually book it through or are you saying that if I book it through AA, they will get me on more sectors with AA therefore reducing the fuel surcharge because AA's fuel surcharge is lower?
Btw, that tool on the One World site seems to be a bit hit and miss. I have actually never managed to make it work properly.