What are Tier Points British Airways?

Related questions

1. Do I get BA Tier Points on Qatar?
2. Can I give my Avios points to someone else?
3. Do Ba reward flights earn tier points?
4. Does avios exist?
5. How do I get my Avios number from British Airways?
6. Can you earn BA Tier Points on Qatar?
7. How far back can you claim Avios points?
8. Is British Airways Executive Club the same as Avios?
9. Do you get tier points when using Avios?
10. What's happened to my Avios points?

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