Can I top up my miles to upgrade?

This is possible, but you cannot do it at the check-in desk. To top up your miles for future travel, please go to the Purchase Miles page.

Related questions

What happens if I experience a problem while checking in online?
Can I use the miles earned on my current flight towards an instant upgrade on the same flight?
If I upgrade, will I be served meals as per the purchased class or the upgraded class?