In December, I will be traveling with my cat for the holidays. He will be traveling as my carry-on luggage. I am concerned about the trip because it will be an all-day affair. I live 2 hours from the airport and will be flying almost all the way across the country. It will be no less than a 7 hour trip once we are actually at the airport. Does anyone have advice on how to travel with your cat during such long time periods when it won't be possible for him to be out of the carrier because of airport regulations?