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

Airlines often invest millions in creating memorable taglines that capture their brand essence and service promise. These slogans become deeply associated with their identity in the public consciousness. This trivia tests your knowledge of famous airline taglines that have shaped the air travel industry over the years. Can you match the iconic tagline to the correct airline?

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United Airlines
Delta Air Lines
American Airlines
Southwest Airlines