Although no scheduled airline fly certain aircraft on a route, sometimes private and royals who use that type can visit a city. It doesn't happen often, so it can slip up on you. For example in Pittsburgh we never had an A340 until 4 May 2002 when my brother got his B.A. and Queen Rania of Jordan came to speak at his graduation.
Don't know about non-airline operators of the A330, or SEA
for that matter, but those are your variables to take into consideration.
By the way, you sure are on top of those hot pictures, always there to capture the moment. Keep up the good work!