CO has had a $90 in cabin Pet Fee for a long time. I have 2 cats that go back and forth to Florida with me, so this is $360 each trip. My (and my wife's) ticket is usually cheaper.
There is an alternative if you live in a JetBlue city. They charge $50 per pet and we will probably start flying them. So, by having an exhorbitant pet fee, CO will also lose our fares. DL flyers should consider this.
Does Airtran have an incabin pet fee?
Sometimes, you wonder who thinks up these things and if they really think them through?