Hi, hope you can answer my query, I am looking to book a lhr-bkk-hkg-dxb-lhr return business saver ticket, am looking to upgrade the hkg-dxb-lhr part to first with miles, if I add a stopover in dubai for a few days will the upgrade price stay the same as a straight through upgrade or will the cost go up as each flights are treated separately.
I appreciate your thoughts and answers