Absolutely agree with Cigarman and Duxfan. There appears to be fewer NW flights "popping up" on the new CO website, even if you search by Best Schedule. It looks like CO programmed the new website to give NW flights only in the direst of need situations (like CLE-MSP).
Keep it up CO and NW will tell you to get lost.
After which AA buys CO, turns IAH into CLE and completely owns Latin and South America. (And Gordo goes to work as a starter at a muni golf course in Houston.)