Yesterday I connected through SEA and it appeared that I had to go out to the unsecured area then reenter and be rescreened, etc. here are the details.

I arrived at the north terminal I think on a Horizon Air flight from Portland. I had to transfer to the south terminal for a connecting flight on Northwest. I was directed down an escalator where a tram took me to the main terminal I think. Either there was no direct route to the south terminal or I missed it so I had to go up a couple of floors to the main area then had to reenter the secured area, then proceeded to the south terminal where I was resreened. The security guy said when I asked if I had done something wrong that he thought everyone had to undergo the additional screening. He said that for instance connecting international pax had to be rescreened before connecting to domestic flights.

I could see that this airport was renovating but I found this airport to be about the most confusing airport I have ever been in. I understand that there was a shuttle van of some sort but it appeared that the only way to use it was to catch it from the main terminal and would require rescreening too. Of course, I was "lucky" enough to be selected for detailed search, had to run to gate, nearly missed my flight, etc. So what could I have done to avoid the rescreening? I plan to avoid this airport in the future, at least until this security hysteria settles down some.