<font face="Verdana, Arial, Helvetica, sans-serif" size="2">Originally posted by Randy Petersen:
... frequent flyer credit cards often promote and offer double miles promotions which when used correctly double the value of the return even without the coalition value of the programs themselves.</font>
Another dramatic example of this was the NWA Visa
promo that gave up to 15 miles per dollar spent on NWA tickets.
If you were going to buy tickets anyway, the promo provided up to 75K free miles - enough to compensate for many years of annual credit card fees.