Hello

I've searched around and couldn't find the answer.

When you flight air Canada for example, when you check in at the 24 hours mark, they offer a cash method to upgrade to business. The price depends on plane load, type of ticket you have. etc... But most of the time everyone can upgrade.

I have a few united flights coming up but specifically to Thailand via Japan. How does United allow upgrades? It seems its on points and cash with your own program. Do they offered a similar upgrade system to AC, one person has no status where the other will be Gold status with star alliance.

If people have upgraded either within 24hrs or at check in, how much has it cost you? Will be flying early February.