I'll be flying out of SeaTac in the next couple of weeks. I went to the TSA "wait times" website, and it says that the shortest line for security is FIS (which I can't use, given that I depart from SEA!), followed by the "SEAC" checkpoint.

What/where is the SEAC checkpoint? The others (Central, North, and South) are all obvious. I checked the SeaTac website but couldn't find any mention of it.

thanks!