There is a very decent freeware 737-700 found on this website
(file name: b737_700.zip) for flight simulator 2004. This file includes several Southwest Airlines liveries, but it is missing some special liveries such as "lone star one" and a couple others. I think it would be a very good idea to repaint this aircraft to include all of the Southwest Airlines liveries, but I am not very experienced in repainting aircraft so I was wondering if anybody here would be up to this challenge. There is a paint kit included in this aircraft so I do not suspect it would be very difficult. I hope that someone decides to try this request.