Correct that Southwest are the best paid pax carriers in the states,however Sherm you will find they are one of the only majors there that does NOT have a unionized workforce.
Where on earth did you get that from? The Southwest Pilots Association represents 5600 pilots and has been involved deeply in contract negotiations with their company for 30 years!
They have lucrative profit-sharing arrangements with their company, as well as wage increases directly tied to company profit increases of up to 8%!
Southwest has also had a management which was far better to negotiate with than those in JQ and QF.