Which airline used the advertising slogan "Fly the Friendly Skies" for nearly 50 years in its marketing campaigns?

Airlines have crafted some of the most memorable advertising slogans in transportation history. These taglines not only sell seats but often capture the essence of their brand identity and service philosophy. This trivia tests your knowledge of iconic airline slogans that shaped the industry's marketing landscape and customer perceptions. Can you match this famous slogan to the correct airline?

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United Airlines
American Airlines
Delta Air Lines
Pan American World Airways