Summary
- United MileagePlus offers three types of upgrades: CPUs, PlusPoints, and MileagePlus.
- Upgrade priority is determined by status level, fare class, and more.
- PlusPoints can be used for Polaris upgrades, but be aware of restrictions and expiration dates.
Good value, or even free, cabin upgrading is one of the most desirable perks of loyalty programs. Miles or points collected in the program can usually be used towards upgrades, and elite status can lead to free…
