Which of these once-prominent airline brands disappeared after merging with Delta Air Lines in 2008, creating what was briefly the world's largest airline?

The airline industry has seen numerous mergers and acquisitions over the past few decades, resulting in the disappearance of once-iconic airline brands. These consolidations have dramatically reshaped the transportation landscape, creating mega-carriers while many beloved brands have disappeared from the skies forever. Test your knowledge of these transportation brand mergers that changed the airline industry!

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Northwest Airlines
Continental Airlines
US Airways
TWA (Trans World Airlines)