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Calculating your SkyMiles

 New York-Atlanta. Right now that trip earns 1,522 miles. Next year, a basic SkyMiles member paying the $302 economy fare on Delta’s website for a typical flight would get 1,510 miles; he would get 3,005 miles if he bought the $601 premium-cabin ticket; and if he were a ‘‘Platinum Medallion’’ member of SkyMiles, he would get 5,409 miles.

 Dallas-New York. Right now, all SkyMiles passengers would scoop up 2,776 miles. But in 2015, the passenger on a $545 round-trip economy fare will get trimmed to 2,725 miles; the one paying $982 to sit in premium will get 4,910 miles; and the ‘‘Silver Medallion’’ — that is the lowest of Delta’s four elite levels — in first class will get 6,874 miles.

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Los Angeles-Atlanta. Here is where it gets interesting. Right now, everybody gets 3,892 miles. In 2015, the basic SkyMiles member flying on a $486 economy fare will drop 38 percent to 2,430 miles; the same person paying $1,726 for the premium cabin will get 8,630 miles; and a ‘‘Diamond Medallion’’ — the top rung — sitting in first class will score a whopping 18,986 miles. That is nearly eight times as much as the vacationer in the back of the plane.

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