Just booked my flights to the Sept IAH DO on CO.COM.

eTicket Itinerary and Receipt for Confirmation arrived via email seconds later with a footnote next to both flights reading "Check-in at the Northwest Ticket Counter"

That might be a little difficult as NW does not serve CRP so there IS NO NW TICKET COUNTER!

I assume that the program that generated the email saw the 55xx flight number and thought it was a NW codeshare as opposed to Chautauqua Airlines, Inc. dba Continental Express.