Which airline's loyalty program was the first to introduce the concept of 'airline miles' as a currency that could be accumulated and redeemed for free flights?

Airline loyalty programs revolutionized how transportation companies build customer relationships. These programs have evolved dramatically since their inception, incorporating sophisticated technology and psychology to retain customers. This trivia question tests your knowledge of a significant milestone in the history of transportation loyalty programs that changed the industry forever. Are you a casual traveler or a transportation loyalty program expert?

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American Airlines' AAdvantage program (1981)
United Airlines' Mileage Plus program (1980)
Delta Air Lines' SkyMiles program (1983)
British Airways' Executive Club program (1982)