Can helicopters fly at night?

Related questions

1. Is the president's helicopter armed?
2. Why helicopters are so expensive?
3. What is the salary of a fighter pilot?
4. Are helicopters or planes more dangerous?
5. How far can private helicopters fly?
6. How much does a helicopter pilot make?
7. What speed do helicopters fly at?
8. What is safer plane or helicopter?
9. Does US Army have fighter jets?
10. Why can't helicopters fly fast?

Tags

1. #badly
2. #something
3. #hitting
4. #unless
5. #prefer
6. #which
7. #conditions
8. #passengers
9. #helicopters
10. #night
11. #cargo
12. #always
13. #important
14. #civilian
15. #optimal
16. #flight
17. #usually
18. #vision
19. #helicopter