I dont know about the other airlines but be advise if you plan on commuting to ORD for Eagle on an Eagle flight (or American, AMR regardless) they will charge you each and every time (unless your lucky enough to sit upfront with the guys, which in the CRJ is most uncomfortable seat in the regional world (my guess is the MD80 is the worst in the industry)). Yes, AMR charges its own employees to ride on its planes.
You may want to factor that into your thoughts. Granted, its not much, maybe $10 each way, but do that twice a week for the next 5 years and it adds up. It was frustrating to me to get my already sad paycheck and see $-14, $-14, $-14, $-14 on it everytime. Just me and my .02