Thanks to all.

Yes, those are both flight numbers. I should have realized that the express flight was unlikely to be near CO51's gate (that plane usually comes from Brussels to EWR before going to IAH, tho this week that's not going to be the case).

Looks like I'll be in an IAH club for a few hours...

I wonder why it was listed as a valid connection?

By the way, I'm coming home on Friday morning via the non-stop, but the timing for the flight to OKC didn't work out.

Thanks, again.