So I'm in ORD today, and I saw SKW everywhere (not surprising, of course)...but I saw what seemed to be an equal number of all three CRJ's (well, more 200/700 than 900)

That just got me curious a bit, as I fly only the EMB-145. Do the 200's fly more out of certain bases, fly certain routes more often, more junior or senior? How often during a month will a Pilot swap a 700 for a 200 and vice-versa?? Also, how often will a crew do east coast and west coast flying on the same trip?

Well that's my ramblings after a long 5-leg day...it is now time for bed!