Join Date: May 2004
Location: formerly Gold now Diamond, formerly MSY, now LAX, formerly NW, now DL
Programs: Hyatt Plat, Hilton Gold, SPG Gold, Delta Diamond/1MM
Posts: 4,725
Generally I think it's better to be elite on the airline that you fly most, so that if there is a problem, you have better access and treatment with them...so you'd probably get NW Silver in a calender year and then get priorty toll-free access to the reservation agents. Also likely more bonus miles and EQMs with the NW WP program. Plus you can burn your CO miles on NW flights too...