I have graphics of the Seattle Center airspace that a controller was nice
enough to send me...it incorporates the airspace that belongs to the SEA
TRACON. Believe me, there is no way for a pilot to know what to expect
because there are some Letter of Agreement "gates" that apply only to
certain types of aircraft going in certain directions. A controller has his
or her hands full simply understanding the restrictions that apply to a
given sector...no way a pilot could remember what applies to ALL sectors.
And, as others have said, the rules change with the time of day, the wind,
and/or other factors.

Bob Gardner

"Joseph D. Farrell" know what to add wrote in
message ...
Hello - I have been looking in the AIM and a few other places and am
trying to track down where enroute approach control end and Center
control altitudes begin. When planning arrivals and depatures through
NYC/DC/PHL and BOS airspace I was curious where those altitudes begin.
I've been told several times that you need to be at 5000 when passing
through those airspaces IFR in Cherokees, etc and and was curious if
anyone knew where the center altitudes start since it would be more
economic on most flights to be higher [unless the winds are howling].
It is just as easy to plan 11000 or 10000 as 9 or 8 for a 350-450nm
leg.

I guess if no one knows, Ill just have to ask next time!

Joe Farrell
N8846J