Northwest has certainly been a good choice for me compared to Delta for domestic travel because of the non-upgradable fares that Delta has. The international network with KLM is really good, and the parternship is really a partnership (compared to DL/AF). Unfortunately, the number of upgradable seats and increasing fare differences for international upgrades has been a disappointment, but is no better with DL. I also chose this because NW is not the #1 carrier out of CMH (by a long shot!), so there is less competition for upgrades (I wonder how many Platinum NW flyers there are in Columbus, OH!). Lines at the ticket counter (even comparing elite lines) are shorter too.