I've seen a NW 742 (probably for the brownies) in august when I was in CLE.

I don't think they boarded from the terminal though.

I'd think CO could allow it as a "shared" gate, so NW could be free to use it if they had to, and it would have the convenient FIS facility attached...

It would be cool if they used the outer gates on the circular part of the terminal for the int'l flights.... that section is much more open... they could build the PC up as a 2 floor deal.