Which airline used the tagline "Fly the Friendly Skies" for 50 years before retiring it in 2014, only to bring it back three years later?

Airlines spend millions on marketing to create memorable taglines that capture their brand essence and promise to travelers. These slogans often become deeply associated with the carrier's identity and passenger experience. This trivia question tests your knowledge of which famous airline tagline made aviation history by being the longest-running airline slogan before it was retired in 2014 after a remarkable 50-year run. Can you identify the correct carrier and its iconic phrase?

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United Airlines
Delta Air Lines ("We Love to Fly and It Shows")
American Airlines ("Something Special in the Air")
British Airways ("The World's Favourite Airline")