Which major airline underwent a controversial logo redesign in 2013, replacing its iconic 'tulip' logo (designed by Saul Bass in 1971) with a simplified globe design often referred to as the 'globe logo' or 'sphere'?

The transportation industry has given rise to some of the most recognizable logos in the world. These symbols not only represent brands but often encapsulate the essence of movement, speed, and reliability. This trivia question focuses on a famous logo transformation in the airline industry that marked a significant shift in brand identity and corporate direction.

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United Airlines
American Airlines
Delta Air Lines
Southwest Airlines