Which major U.S. airline was the first to create a 'Million Miler' loyalty program tier that grants lifetime elite status to passengers who fly one million miles?

Airline loyalty programs are among the most sophisticated in the transportation industry, offering tiers of benefits that increase with customer engagement. One particularly exclusive tier has gained legendary status among frequent flyers. Test your knowledge about this elite transportation loyalty program milestone that represents the pinnacle of customer retention strategy in the airline industry.

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American Airlines with its AAdvantage program (1981)
Delta Air Lines with its SkyMiles program (1983)
United Airlines with its Mileage Plus program (1980)
Pan American World Airways with its WorldPass program (1979)