Which famous transportation company used the advertising slogan "We love to fly and it shows"?

Advertising slogans can define brands and shape consumer perceptions in the transportation industry. Some taglines become so iconic they're remembered for decades and help companies gain market share. This trivia tests your knowledge of influential advertising campaigns that transformed how people think about mobility, travel, and transportation services. Can you identify which slogan belongs to which transportation company?

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Delta Air Lines
American Airlines
United Airlines
Southwest Airlines