How do I use miles to upgrade on American Airlines?

Related questions

1. How much are American Airlines miles worth?
2. Can I use Alaska miles on American Airlines?
3. Did American Airlines buy US air?
4. What happened to US Airways?
5. Is it worth getting an airline credit card?
6. Are airports federally funded?
7. Can you use American Airlines miles to upgrade on Qantas?
8. Can you add American Airlines miles after flight?
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Tags

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19. #single
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21. #airlines
22. #service