I would stick with CO. The CO planes are much more modern. On international flights you get your own movie screen in coach.

Plus, when you get elite status in CO, you are also basically an elite on NW. Which makes you an elite on two major carriers for the price of one! But Delta (the jr skyteam partner?) will not honor elite status except for its own Skymiles medallion members. And so, the other carriers usually do not honor Delta elites either.




TJ