Originally Posted by corporate-wage-slave

The calculation is explained at the top of the thread, but it's based on the whole journey, so ORD-RSA-LAX. So assume you booked both travellers in full Avios for the whole trip and then slice down from there. By all means put the details into this thread if you want them worked out. The surcharges should not be a fight issue, the second passenger may be since in the past BA have argued that GUFs and Twofers were "free", however they have lost a number of court cases on this. CEDR have given at least one ruling in the other direction, supporting BA's position (kind of, it was a somewhat unusual logic) so I would be seeking to go MCOL on this.