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Free flight upgrades happen and are not that rare. Getting them without frequent flier miles takes a little creativity, thought or tact, but it can be done. There are also a few creative ways to get frequent flyer extra flier miles that lead to free upgrades including cash-equivalent purchases on miles cards.
Complete article link: http://www.helium.com/items/2321510-how-to-get-free-frequent-flyer-miles
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