What does economy flexible mean on United Airlines?

Related questions

1. What size carry on United Airlines?
2. How do I add United flight to United?
3. What is the difference between economy and premium economy on United?
4. Can I bring a backpack and a carry on United Airlines?
5. What isn't allowed in a carry on?
6. Can I bring a razor in my carry on United?
7. What credit score do I need for United MileagePlus?
8. Is the United Club worth it?
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10. What is the baggage policy for United Airlines?

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