Thanks for the great advice so far from everyone. Just a little more information for those who asked about my flying habits. Almost 95% of my flight are between SEA and FLL. I am taking one flight, next week, to D.C.. I also will be taking flights from SEA-JFK and SEA-MCO. Otherwise, just the back and forth from home to school. Right now with DL, I am 100% on upgrade success. However, I am looking into long term benefits, like MM qualifying, as I am only 23. I good stable program which is not going under anytime soon is what I like. DL has been good, but always interested in seeing what else is out there.