how to upgrade to first class on delta for free ?
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As per Delta airline's First Class guidelines, all the travelers who are Medallion Club members are eligible for a complimentary upgrade to premium class and Comfort. Delta upgrade to first class can help you to live your dream and can even add on some special perks like attention staff, expensive premium meals, and many more and can live at the luxury position. The travelers who are upgrading under the given guidelines will get a free upgrade to the first class.