As an expert in the aviation industry, I can provide you with information on the largest airlines in terms of various metrics such as passengers carried, fleet size, or revenue. One common measure is the number of passengers carried, and as of my last update, the largest airline by this measure is
American Airlines. They operate a vast network both domestically within the United States and internationally. However, it's important to note that the status of the "biggest" airline can change over time due to various factors such as market conditions, mergers, and acquisitions.
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