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UA Upgrades Help

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When I use ff miles to fly biz class I purchase the ticket with the full amount of miles. I am interested in understanding how the upgrades work using miles. If I purchase a regular economy ticket, how do I upgrade to biz class? I gather I have to buy a ticket in a certain category/class? If that is correct, can I do that online? Then how does one upgrade to biz class? Does it cost $ or miles or both? On a roundtrip tix, I assume I can just upgrade for the outbound segment (or just the return). thanks for your help.

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