Originally Posted by
bangkokiscool
I was hoping I could check in under both tickets! How do airlines that require plus size passengers to purchase two seats handle this?
No you cannot check in for both flights.
You need to make up your mind how to handle this. People who book 2 seats have a way of doing this via CX. You won't be doing that.
You either upgrade your segment (with cash) or tell your employer that you won't fly in Y. If you miss one segment or whatever, you risk the entire ticket being cancelled and not usable unless you sort out your priorities.