Originally Posted by
xianrocker
What happens if you book a full Y fare and there are no premium economy seats for routes that specifically sell those seat (i.e. HND-LAX)? Do you get stuck with a regular economy seat even though you've paid for a premium seat?
You didn't pay for a premium seat. You paid for a regular seat. They upgrade Y to premium economy only on a space-available basis, even when the aircraft has premium economy. If you want to confirm a premium economy seat, you have to buy a premium economy fare (usually higher than a Y fare).