How do airlines decide who gets their seat upgraded?

[ahlam1399]

http://img-s-msn-com.akamaized.net/tenant/amp/entityid/AAuu3Yi.img?h=100&w=100&m=6&q=60&o=f&l=fEver wonder how airlines decide who gets a seat upgrade on flights? Airlines say it's strictly by the book: Loyal customers are rewarded based on their status in frequent flyer programs.But some flyers insist that once in a while, they...

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