The Petmate Sky Kennel stays safe and durable during travel while keeping pets comfortable and stress-free. The heavy-duty plastic shell . non-corrodible wing-nuts . extra strong steel wire . and interlocking door provide long-lasting protection. The 4-way vault door offers extra security . keeping the door locked in place and safe for transport. The ventilation openings surrounding the kennel help keep pets comfortable by providing plenty of fresh air. The kennel also comes with a travel kit full of necessities . such as 2 “Live Animal” stickers . clip-on bowls . and ID stickers. The kennel comes in six sizes from 21″ to 48″ for all sizes of pets. The larger sizes offer a vaulted door with a horizontal wire for extra security . while smaller sizes have a carrying handle for easier transport. The kennel meets most airline cargo specifications for easy and safe travel . but pet owners should always check with individual airlines.