Which transportation loyalty program was the first to introduce the concept of 'miles' as a currency that could be earned and redeemed across multiple partners beyond just flights?

Customer loyalty programs have become a cornerstone of the transportation industry's retention strategy. From airlines to rideshare services, companies are constantly innovating ways to keep customers coming back. This trivia question explores a significant milestone in transportation loyalty program history that revolutionized how travelers perceive brand loyalty and changed the industry forever.

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American Airlines AAdvantage (1981)
United Airlines Mileage Plus (1983)
British Airways Executive Club (1988)
Delta SkyMiles (1995)