Agreed. I've been upgraded twice on BA travelling from London to the US and have not been asked for any more dosh. It's purely at the discretion of the check-in or gate staff.
Make sure you ask them if they can mark you as SFU (Suitable for Upgrade) then if seats become available you'll be in with a shout.
Make sure you ask them if they can mark you as SFU (Suitable for Upgrade) then if seats become available you'll be in with a shout.
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