You do realize that ORD is the hub of AA as well don't you??
If you are considering which airline to join based solely on "hub" status then you should give serious consideration to AA.
Trust me, domestic upgrades for a 1-2 hr flight aren't worth it. Since AA has MRTC you won't have to sit in a cramped coach seat. Once you finish law school, you'll want to upgrade to biz internationally with all your miles, and of course the easiest airline to do that on is with AA.
Oh -- be sure to cash in your 1500 US miles before they declare bankruptcy. Things don't look good for US Air.
[This message has been edited by sgopal2 (edited 06-14-2002).]