Sometimes bad things happen, even on CO.
Switching to another carrier is a typical impulse. But when you do and the honeymoon period ends, ..... welcome back!
Seriously, I have tried all the others (given that CO is weak on the west coast). I have had some nice experiences on Delta ... and some truely horrific ones! They used to be great, but are very, very inconsistent with some of the rudest check-in/gate agents I have ever come across.
Try this one on for size. Flying business class on Delta from Cincinnati or Atlanta to Rome (can't remember which one). I had this mega-fat FA who bends over me to serve wine to the guy next to me. She literally smothers me. Then she looks at me and says "A lap dance will cost an extra $20."
I wasn't angry and didn't complain. But if you spend $6,000 on a ticket, you don't expect an enormously fat person (male or female) to bend over ON TOP OF YOU instead of being more careful. The lap dance remark was because she was ON TOP OF ME. Not exactly Singapore Air!