Which major airline has used the slogan "Fly the Friendly Skies" as a cornerstone of their brand identity?

Airlines invest millions in creating memorable brand identities that resonate with travelers worldwide. Their slogans often capture the essence of their service philosophy and what sets them apart in the competitive transportation industry. This trivia question tests your knowledge of one iconic airline's brand positioning that has remained consistent for decades, embodying their commitment to customer service excellence in the transportation sector.

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United Airlines
Delta Air Lines
American Airlines
Southwest Airlines