No such thing exists at ORD. Seems like the mantra at ORD is "nothing except the single line" including premium security lines to get into T5 or get through the final exit from the customs/immigration hall in T5.

Also, for anyone interested in walk-ins at ORD for the final GE interview, be warned that there are a LOT of scheduled interviews (agent said 200 of them today alone) and that walk-ins are not allowed and if you come early for a scheduled appointment you will slot behind everyone who comes in with a time earlier than you. I got lucky this morning after arriving at 9am with a 13:20 appointment (after being told I could come early). As each new appointment block came in they took those people and it was not until they got to an unusual point that the waiting area was empty that they let me come back. The interview was straightforward and friendly, but the uncertainty if I would get in quickly was present until the moment I went to the back for the interview.

Bottom line, don't plan to go very early and get taken care before your scheduled time at ORD.

Dan