ges123, your outbound flight should be fine. There is no security check after getting off your NW flight to exit the terminal. The quickest route from NW Terminal 2 is after exiting the lower baggage claim level, proceed (in the direction of Encounters Restaurant) on the sidewalks adjacent to the parking structures. Continue on toward Terminals 6, 7 or 8 (all have UA gates) which should take you approximately five minutes plus without luggage. You, of course will need to go through security for your UA flight.
My previous post pertained to your return trip. A couple of your posts snuck in on me.
Good luck and happy travels!
[This message has been edited by MRLIMO (edited 10-15-2001).]