The last time I was there, PanAm lived on in the airline memorabilia store at ORD. Exit T3 through the tunnel to the Hilton; it's on the right directly opposite where you'd turn left to enter the hotel.

Eastern, Northeast and a whole bunch of others live(d) on there, too. Great way for airline freaks like many FTers to spend some time during a connection if you don't mind re-entering through security again, or (e.g., international arrival to domestic departure) you have to anyway.