Which airline famously used the advertising slogan "Fly the Friendly Skies" for decades before temporarily retiring it in 2013 and then bringing it back in 2017?

The transportation industry has produced some of the most memorable advertising slogans in marketing history. Airlines particularly invest millions in creating catchy taglines that capture their brand essence and connect with travelers emotionally. This poll tests your knowledge of iconic airline advertising campaigns that have shaped the commercial aviation landscape. Can you identify which major carrier launched the famous slogan below?

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United Airlines
American Airlines
Delta Air Lines
Southwest Airlines