Originally Posted by M60_to_LGA

I hope you're right. If they blocked AA/B6 and B6/Spirit, they should be able to block this too

Right now there are 5 large credit card banks in the country - Chase, Citi, Amex, Cap One, and Discover. Getting rid of Discover,and letting a V/MC card issuer take over its payment network on top of that, would be very bad.