On Thu, 22 Nov 2007 07:04:47 -0800, C J Campbell
wrote in
2007112207044775249-christophercampbell@hotmailcom:

What you have is a bunch of airplanes traveling a narrow corridor
through a bunch of class D airspace areas while remaining under a low
class B ceiling. Sure, you could call up Tacoma Narrows, and McChord,
or SeaTac, or Boeing Field, or Fort Lewis, or Renton, and transit their
airspace, but doing so requires you to be constantly looking up the
proper radio frequency from a whole list of different ATC frequencies
and figuring out which one is appropriate to use for your location and
direction of flight, all the while trying to fly the airplane and see
and avoid other aircraft.

Or you could request Radar Traffic Advisory Service, and let ATC
coordinate the transitions.