Hello, I'm an expert in the field of aviation and travel industry. When considering the "biggest" airline, there are several metrics that can be used to define this, such as fleet size, annual revenue, or passenger numbers. As of my last update, the largest airline in terms of passenger numbers is often Delta Air Lines, but in terms of fleet size, American Airlines holds the title. However, these rankings can change over time with market fluctuations and changes in business strategies.
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