Let me give my take from an investor's viewpoint. The good things about Southwest's stock is that it has a relatively low P/E and that P/E is as low as it has ever been. Cash flow is expected to grow and the EPS is in the top 10% in the industry.
The bad things include that there are 7 sellers for every 3 buys of the stock, the projected EPS estimate has gone down recently and the EPS growth over the next five years is projected to be negative.
Looking at the financial aspects, I see that the Return on Equity at 9% is about half of what I look for in a good company. The sales growth rate is less than the 25% I would like and the EPS growth rate is barely positive. Year over year earnings have been positive except for 2004/2003.
Bottom line is that from my perspective, I would rather invest in AMR, CAL, and SKYW over UAUA, MESA, LCC, and LUV.