Can you buy an extra seat on a flight?

Related questions

1. What is the safest Boeing plane?
2. Is it safer in the front or back of a plane?
3. Is it safer to fly at night?
4. Are exit seats on planes better?
5. Which airline has the most legroom for international flights?
6. Where do you feel the least turbulence on a plane?
7. Which is the best seat to sit on a plane?
8. What engines are on Airbus a320?
9. Do you feel less turbulence on bigger planes?
10. Is it better to sit in the middle or back of a plane?

Tags

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6. #large
7. #should
8. #booking
9. #first
10. #original
11. #class
12. #airlines
13. #second
14. #purchase