What is the max Mach speed?

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Tags

1. #airplane
2. #subsonic
3. #aircraft
4. #guinness
5. #nearly
6. #traveling
7. #world
8. #faster
9. #records
10. #would
11. #recognized
12. #speeds
13. #supersonic
14. #record
15. #sound
16. #powered
17. #twice
18. #scramjet
19. #speed
20. #flying