Is there a difference between Priority Mail and Priority Mail Express?

Related questions

1. Does USPS deliver priority mail on weekends?
2. Is USPS Priority Mail insured?
3. Are Priority Mail envelopes free?
4. How long does Priority Mail Express International take?
5. Does USPS refund for late delivery?
6. How does Priority Mail work?
7. Does Priority Mail require a signature?
8. Can you use your own envelope for priority mail?
9. Does Priority Mail have to be in a priority box?
10. How does USPS Priority Mail work?

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