Originally Posted by RedDevil83

Just to clarify something before I book a ticket, if I'm flying LHR-MIA-MCO , booked through BA on BA stock and with the LHR-MIA on BA with the MIA-MCO on the prime AA flight number, I would be able to upgrade from CW to F with avios yeah? I was a bit thrown reading the wiki about mixed flights where one section seemed to indicate I class wasn't upgradeable, unless I've misread and that was meant for AA flights rather than BA flights..?