Airport/Pet kennel

Im moving back to the US in a week and a half, and need to know where to buy a small pet kennel so that I can take my dog on the flight with me. Also, any easy ways to the airport. I can take a taxi, but I live in Guseo-dong and don't know how far or how expensive it can be. Once again, I live in Guseo-dong so any easy ways to the airport from there, or anywhere on the subway line that I can go to buy a dog kennel. Thanks!