Can I use my miles to book a ticket for someone else, or vice versa ?

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1. What is Frequent Flyer Program?
2. If I have 50,000 American Airlines miles, does that mean I can only use them on American Airlines flights?
3. When I use frequent flyer miles, will my flight be free?
4. If I am using miles from one airline but flying on a partner airline, whose award chart do I use to determine how many miles it will cost?
5. How do I earn the Point in my Frequent Flyer Card ?