What is the difference between economy and premium economy on United?

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Tags

1. #business
2. #carriers
3. #offer
4. #international
5. #cabins
6. #other
7. #difference
8. #legroom
9. #tries
10. #split
11. #class
12. #cabin
13. #premium
14. #between
15. #extra
16. #economy
17. #seats
18. #style
19. #united