Do you have to fly BA to use lounge?

Related questions

1. Can I use British Airways Avios on Qatar Airways?
2. What does premium economy mean on British Airways?
3. Do British Airways Executive Club miles expire?
4. How far back can you claim Avios points?
5. Do you still get tier points when using Avios?
6. How do I get my Avios number from British Airways?
7. Can I use Avios to buy flights for someone else?
8. Does BA World Traveller plus get lounge access?
9. Is BA Executive Club the same as Avios?
10. Can you earn BA Tier Points on Qatar?

Tags

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2. #unless
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4. #accessing
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7. #flight
8. #within
9. #international
10. #airways
11. #airline
12. #program
13. #flyer
14. #frequent
15. #partners
16. #foreign
17. #lounge
18. #status
19. #alliance