Hello,

I am sitting in the F-lounge waiting for my sister for our flight later today to Hamburg. She's doing MAD-LHR-HAM, currently flying on BA457. I've enquired about a possibility of upgrading her to Club Europe, so she could sit with me - no Airport upgrade offer and no way to upgrade with avios... but there's still availability to book a seat for 7750 avios - can I do that? she's got hold luggage, so would they offload her if she checks in with her new boarding pass? Any advice will be appreciated!