1) Seattle-Tacoma International Airport, just south of Seattle and north of Tacoma. Main airline - Alaska Airlines.
2) A city between Seattle and Tacoma, 10 square miles in area with a population over 25,000. The borders surround SeaTac Airport, but the Airport does not belong to the city. Previously Unincorporated King County, SeaTac became a city in February 1990.
1) I fly out of SeaTac tomorrow morning.
2) A: Where do you live?
A: You mean at the airport?!
B: No. SeaTac is a city, too.
A: UrbanDictionary doesn't say it is...
B: Well, it is a city...and it says it now.