I think this is the best place for this question... I just received a targeted promotion for two months of GM and Sky Club membership - I don't get many promotion offers, and have never used a Sky Club. I have two trips planned between now and the end of the promotion. Neither is eligible for upgrades (one w/ companion cert and the other on CRJs). So, the Sky Club membership is really to biggest perk of this promotion. Do I just give my Skymiles number to access the club?