I need your help again. I’ve only ever used my Krisflyer miles to upgrade on SQ and found it very easy. I’m really unsure how a Star Alliance upgrade works.
How do you use Krisflyer miles to request an upgrade on a United flight?
Is it best to call United and book the correct, upgradable class of economy airfare first?
Do I request the upgrade through SQ website or United?
Can you find out before booking if there are upgrades available on your flight?
Your knowledge and experience would be greatly appreciated.