Mileage Run Discussion, which is described as "Discussion of methods to maximize miles and/or points either through trips dedicated to no other reason than the miles/points, or through creative alteration of trips to extend their earning capacity in often unique ways."

http://www.flyertalk.com/forum/milea...iscussion-627/

There's also a far easier method than putting in random cities on Delta.com. Google.com/flights, put in your origin city and dates you can travel, and filter to Skyteam airlines.