Credit: Flying on Air

"Air travel for pleasure is a consumer product, just like a new car or TV set, and people should be able to buy it just as easily as a consumer product, in installments." So says American Airlines President Marion Sadler—and he is seeing his wish take wings. Air travel is the fastest growing segment of the nation's credit-card business. Already, a total of 61 U.S. and foreign airlines have agreed to honor American Express's credit card, 48 are honoring Diners' Club, and 31 do business with Hilton's Carte Blanche.

Last week American Express signed up with Trans World Airlines...

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