Now that many U.S.-based airlines are charging co-pay fees for upgrading from economy class to business or first, and considering some of the other fees you’ll now pay to use your frequent flyer miles (see chart), Airfarewatchdog suggests you think twice if you’re collecting most of your miles with a credit card.
Sure, the bonus miles you can earn by applying for a new card can be tempting, as was the case recently when the British Airways Chase Visa Card offered an incredible 100,000 miles to new applicants, but once you’....