How do I use miles to upgrade on United?

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Tags

1. #upgrades
2. #miles
3. #mileageplus
4. #global
5. #reservation
6. #account
7. #existing
8. #options
9. #select
10. #regional
11. #upgrade
12. #redeem
13. #premium
14. #access
15. #option
16. #available
17. #these
18. #cabin