CO 60% Mostly RJ's from SDF upgraded 25%
NW 40% upgraded 75%
I have also started flying NW more often because I have more opportunity to upgrade due to their use of larger aircraft from my home airport. I HAVE to use CO at times because ONLY they fly to some of my business destinations from SDF. If I had a choice, I would probably change airlines. CO has definitely changed for the worse recently.