Seattle/Tacoma Intl Airport is SEA and Toowoomba Brisbane West Wellcamp Airport is WTB. These codes are created by the International Air Transport Association (IATA) and airlines use them to identify the departing and arrival airports in the flight routes they service. Spokane Airport (GEG), Pasco Tri Cities Airport (PSC), Bellingham Airport (BLI), Everett Paine Field Airport (PAE), Pullman Moscow Regional Airport (PUW) are other airports near this flight route and their unique identifiers/IATA codes.