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Old Jun 6, 2016 | 11:24 am
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MSYtoJFKagain
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Upgrading to Mint closer to flight

I've got a wedding in Monterrey in October and I need to book my flights JFK->SFO fairly soon to lock in a seat.

My question is:

I'm slated for a bonus in the interim period (Possibly) and was going to treat myself to another lovely Mint experience. What are the rules governing upgrades from base fare (Basic Blue, non-ref) to Mint? Is it just fare difference? I'm a Mosaic member if that makes any difference.
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