I fly a fair amount, but do not have elite status on any airline. With all the current promotions like the AA Gold/Plat challenge and the Delta double mile offer, I am considering a mileage run or two in the next few weeks. The AA challenge seems easiest, but I would consider AA,DL,NW, or UA. As far as I know, there are no current promotions for NW or UA. Are the benefits of the entry level elite status with AA or DL worth spending a few hundred to get?

Thanks guys,
John