anon wrote:
25 billion divided by over 50 million cardholders? That's $500 per AMEX
card holder.


No. Credit cards typically give one point per dollar spent, and points cost
anything between 2 to 4 cents. But in the case of Amex, it is likely that it
is paying at the low end of the cost per point.

Number of cardholders isn't so important. It is the number of cradholders with
the Delta affinity card (eg: those who have their "goodies" converted to Delta
FF point) with average spending for those customers.