Well, there's also the addiction part for those flying

"Beyond the cash, carriers reap something else from the cards: These deals remain lucrative in both good times and bad, as they are immune to economic cycles. That’s because of the addictive nature of miles, a dubious commodity that tens of millions of Americans, particularly those who fly for their jobs, will probably never quit."

I would also add, AC's wet dream might be realizing just a percent of what these guys do.


“Fundamentally, airlines are selling miles to credit card companies for much more than they will cost the airline when those miles are redeemed—and they are doing it hundreds of billions of times a year,” Stifel wrote in a February client note."