Originally Posted by BLI-Flyer

AA flights will earn you elite credit and elite bonuses (if you qualify) as long as you give your Alaska FF number. Flying CO earns you straight miles, no bonuses and no elite credit. All is explained on the AS websiste here:

http://www.alaskaair.com/mileageplan...rs_Airline.asp

You will not get free upgrades to first class on AA based on your Alaska MVP/MVPG status. As an MVP/MVPG you will get free upgrade coupons for domestic NW flights that sometimes work.