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

Brand slogans often become iconic representations of transportation companies, sometimes even outliving specific marketing campaigns. These catchy phrases capture a company's brand promise and market positioning in just a few words. This trivia tests your knowledge of famous transportation company slogans that have shaped consumer perceptions and brand identities across the industry. Can you correctly identify which transportation company used this famous slogan?

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United Airlines
Delta Air Lines
American Airlines
Southwest Airlines