Does headwind increase or decrease airspeed?

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Tags

1. #speed
2. #magnitude
3. #termed
4. #headwind
5. #ahead
6. #airspeed
7. #otherwise
8. #desired
9. #means
10. #tailwind
11. #towards
12. #increased
13. #relative
14. #blows
15. #direction
16. #ground
17. #effectively
18. #aircraft
19. #which
20. #takes