How many SkyMiles does it take to get that free flight on Delta? The sky is the limit.

A business-class seat from Sydney to Atlanta, for example, has just jumped from about 350,000 miles in May 2016 to 750,000 in June 2016, for a flight that would cost nearly $6,200 in cash.

Starting next summer, Delta will once again fundamentally change its SkyMiles program. As with the Sydney example, some of the priciest routes will no longer have a cap.

But the changes will affect the least expensive routes, too.

On the plus side, Delta says it is making more flights available for 25,000 miles or less, but the availability will depend on “destination, demand and other dynamics.”

To learn more about what exactly those "three Ds" mean for frequent fliers, along with rates in miles for a few sample routes, click here to read the full story on myajc.com. You'll also learn why Delta is making the changes and what other airlines are doing.

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