Which innovative advertising technique did Southwest Airlines pioneer in the 1970s that revolutionized airline marketing and is now standard practice in the transportation industry?

The transportation industry has been a canvas for some of the most innovative advertising campaigns in marketing history. From airlines to rideshare services, companies have found creative ways to capture consumer attention while they're on the move. This trivia question focuses on a groundbreaking advertising technique that transformed how transportation companies connect with customers and build brand recognition.

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Painting aircraft with distinctive liveries/designs instead of standard corporate colors
In-flight safety demonstrations performed as entertainment shows
Fare comparison billboards placed strategically near competitors' ticket offices
Celebrity pilots featured in television commercials