I might have to take Nutmeg up to Chicago in a few weeks, and was wondering what everyone's thoughts or experiences with plane travel has been. She is over 20 pounds, so I don't think she can be in the cabin under the seat. Is this true? Anyone had dogs travel the other way? (Don't know what it's called). With the luggage?? The Doggie Airline does not fly out of Florida, or I would totally do that.