Originally Posted by m0hamed

I just looked this up http://www.qantas.com.au/travel/airl...gage/global/en

Additional baggage allowance is available for Qantas operated flights with a "QF" flight number. It is not available for flights operated by another carrier (such as codeshare or interline flights) or if connecting on the same-day to a flight operated by another airline. The additional baggage rates of the operating airline applies in these instances.

You may be on a codeshare, however your operating carrier is QF. Sounds like it may not be able to be done online, but I would argue you should at least be able to be offered the prepaid excess rates when you arrive at the airport, due to the limitations of their system.

FYI - when we have booked QF flights on the BA flight number through AMEX Travel, in our frequent flyer booking we always have two PNRs for the same booking. I would expect this is the PNR you chose seats with?