Which airline is known for the famous tagline "Fly the Friendly Skies"?

Airline companies invest millions in creating memorable taglines that capture their brand essence and promise to travelers. These short phrases often become iconic parts of their identity, influencing consumer perception and loyalty. Test your knowledge of these famous transportation slogans that have shaped the airline industry's marketing landscape over the years. Can you match the tagline to the correct carrier?

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United Airlines
Delta Air Lines
American Airlines
Southwest Airlines