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

Airline loyalty programs have revolutionized how travelers choose carriers, creating some of the most valuable marketing assets in transportation. These programs generate billions in revenue through partnerships with credit cards, hotels, and retailers. Beyond just free flights, they've evolved into complex ecosystems with elite status tiers, experiential rewards, and even their own currencies. Test your knowledge about one of the most influential loyalty innovations in transportation history!

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American Airlines AAdvantage (1981)
United Airlines Mileage Plus (1979)
British Airways Executive Club (1974)
Delta Air Lines SkyMiles (1983)