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Does anyone know when you upgrade this way do you get all the mileage benefits, as if you bought the fare initially? As you experienced people know
only certain fare's are upgradable i.e. west coast bonus .etc??

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yes, you are not upgrading the booking class or fare basis code ...just buying up for a better coach seat. the base flight miles you get will be the same regardless of what class (Y, C, F) you are in. ONLY bonus miles will differ across elite member level, fare class, and booking code.