How do open return tickets work?

Related questions

1. Are open ended tickets more expensive?
2. Does Aegean Airlines serve free food?
3. Whats the difference between basic economy and economy?
4. Is Aegean Airlines part of Star Alliance?
5. Do you have to pay for baggage on Caribbean Airlines?
6. Can I take my phone charger in my carry on?
7. What is the difference between economy and economy Flexi?
8. How long does an open return last?
9. Can you use a train ticket twice in one day?
10. What is economy non flex on Caribbean Airlines?

Tags

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2. #types
3. #valid
4. #tickets
5. #ticket
6. #specific
7. #doesn
8. #outward
9. #services
10. #there
11. #return
12. #fully
13. #month
14. #flexible
15. #choose
16. #anytime
17. #journey