Once again Southwest Airlines has shown that they do not care about customer service. The plane was late starting out which is usual for Southwest. I can't remember the last time one of their flights was on time. I started in Milwaukee and flew to Denver. Once we were in Denver the transfer flight was 1 and 1/2 hours late taking off. They had a maintenance crew on board repairing a problem. This seems to happen often so I wonder if they do preventive maintenance or wait for something to break before they address it. When I arrived in Las Vegas they had lost my luggage. I was told that it is not unusual because Denver is such a big airport. There were about 20 other passengers that had their luggage lost also. If they know about this luggage transfer problem, FIX THE PROBLEM. I went home and waited for their call to say they found my luggage which was about 3 hours after my flight landed. When I returned to the airport they said they were still looking for it. 2 hours later I finally received my luggage from them. and it looked like it was dragged around the runway. If at all possible use another airline.