Travel in comfort and style with Sherpa Original Deluxe Carrier. Perfect for traveling by plane or car, for a trip or just to the vet. Patented spring wire frame allows the rear end of the carrier to be pushed down several inches to conform to underseat dimensions. Approved for use on most major airlines and small and medium sizes are included in Sherpa's Guaranteed On Board program. See www.flygob.com for details. The Sherpa Small Original Deluxe Carrier is Guaranteed on Board on the following airlines: American Airlines, AirTran, Alaska Airlines, Southwest, US Airways, United, West Jet The Sherpa Medium Original Deluxe Carrier is Guaranteed on Board on the following airlines: American Airlines, United .