Which major transportation company underwent a complete rebranding in 2003, changing its name from AirTran Airways to better reflect its expanded services and modernized fleet?

Brand identity in the transportation sector often evolves to reflect changing market dynamics, technological advancements, and shifting consumer perceptions. When executed effectively, rebranding can revitalize a company's image and position it for future growth. This question explores one of the most significant brand transformations in the transportation industry that successfully repositioned a company for the modern era.

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JetBlue Airways
ValueJet (which became AirTran Airways after a 1997 merger)
Southwest Airlines
Frontier Airlines