For the SS, just wanted to confirm the definition of “originally booked”…

I know that this language is to exclude eUps, OpUps, LMU, Bid Upgrades, etc.

However if I “originally” book a seat in Y and then decide to paid upfare in advance so it is ticketed in Z; I would still get SS right? I didn’t technically “originally book” in the fare class but I imagine this is more like a flight change, so from the time I pay for the fare difference does that become the new original booking in Z?

Assuming in this case they wouldn’t see the original booking anymore, but just thought I’d ask as I really don’t feel like being turned away!