Is USPS first class or priority mail faster?

Related questions

1. Does Priority Mail move on Sunday?
2. Is USPS Priority Mail certified?
3. What is the difference between Priority Mail and Priority Mail Express?
4. How Fast Is Priority Mail Express?
5. How does USPS Priority Mail work?
6. How is priority express mail delivered?
7. How is priority mail delivered?
8. How does Priority Mail work?
9. Does priority mail cost more?
10. Does USPS fly Priority mail?

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