I will be flying through SeaTac, arriving from SFO on Alaska Airlines
to connect to an Icelandic flight to Reykjavik. Does this all happen
airside of the TSA, or do I have to go through a second security
screening? One of the guide I found for SEA indicates the gates used
by Alaska, but noee show which gates are used by Icelandic.

Icelandair uses gates in the south satellite:

http://www.portseattle.org/Sea-Tac/F...s/default.aspx

Unless something has changed since the last time I was there, you can
get from any gate to any other gate by walking or taking the little
train without leaving airside, including domestic to international
connections. International to domestic by policy (not just at SEA)
all require TSA screening after you go through customs.

R's,
John


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