Do MileagePlus miles expire?

Related questions

1. What are Lufthansa select Miles?
2. Can you use United miles to upgrade on Lufthansa?
3. Do Lufthansa Miles count for United?
4. Does Lufthansa have a rewards program?
5. How many miles does a frequent traveler get?
6. Which airline group is Lufthansa?
7. Is Lufthansa Miles and More a credit card?
8. Are KLM and Lufthansa partners?
9. What frequent flyer program is Lufthansa?
10. What is Lufthansa HON Circle?

Tags

1. #redeem
2. #happening
3. #miles
4. #there
5. #airlines
6. #expiry
7. #after
8. #because
9. #months
10. #their
11. #number
12. #inactivity
13. #worry
14. #united
15. #reset
16. #prevent
17. #expire