What's the difference between Priority Mail and Priority Mail Express?

Related questions

1. Does USPS deliver priority mail on Sundays?
2. How Fast Is Priority Mail Express?
3. How does Priority Mail work?
4. How safe is priority mail?
5. How is priority express mail delivered?
6. What is USPS 2 day priority mail?
7. Does Priority Mail have to be in a priority box?
8. Does USPS refund for late delivery?
9. Do you have to sign for USPS Priority mail?
10. Does Priority Mail deliver on Sundays?

Tags

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2. #shipments
3. #priority
4. #business
5. #fastest
6. #service
7. #express
8. #depending
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10. #limited
11. #weight
12. #distance
13. #rates
14. #options
15. #travel
16. #domestic
17. #based
18. #envelope
19. #formerly
20. #commitment
21. #shipping