It's been years since I've paid close attention to DL's Skymiles, but I recall their benefits aren't too "beneficial" for folks who tend to buy the cheapo tickets. Would there now be some incentive for these "cheapo travellers" -- particularly those stuck in DL hubs -- to switch their allegiance to CO or NW? Seems like they wouldn't lose too much, and might gain a little. I don't see any incentive for ANY CO/NW frequent flyers to change programs, however.