I fly DL for 2 reasons:
1. They are the only airline flying out of MLB.
2. Old habits die hard. I've flown DL almost exclusively for the past 8 years. In 1996, I moved from WI to FL and was heartbroken when I had to switch from United to Delta. I soon came to love DL much more than United. But the past couple of years on DL has not been great for me, and I probably will switch to someone else again. I do think all airlines are basically the same, they all have their good and bad points. I just have to try to find the airline that has more good than bad points for me.