I am about to take a new position within my company that requires heavy total US and Canadian travel...3 or 4 days per week originating in Tampa. This after being fairly inactive flyer for the past three years. I am taking a hard look at the carriers that I can choose from for the best FF program...my goal is to be upgraded as much as possible. They are AA (Gold for life...Million miler), NWA (currently Silver but will lose this in March), and Delta (not an elite member). I may go back to American but I don't like their $40 coupons for upgrades nor plans to squish coach seats closer again. NWA is very liberal with upgrades but not certain that it is the best choice for total USA/Canada travel. Delta has the most flights out of Tampa but wonder if new FF pgm changes are really all that good. Of AA, DL, or NWA, which would you choose? Thanks for your opinion.