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

The transportation industry is filled with memorable taglines that airlines use to distinguish themselves and capture their brand promise. These slogans often reflect an airline's values, service quality, or unique selling proposition. Test your knowledge of these famous airline taglines that have soared through marketing campaigns worldwide. Can you match these catchy phrases to the correct carrier?

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United Airlines
Delta Air Lines
American Airlines
Southwest Airlines