American Airlines, Inc. (AA), commonly referred to as American, is a major American airline headquartered in Fort Worth, Texas. It is the world's largest airline when measured by fleet size, revenue, and scheduled passenger-kilometres flown, and the second largest by number of destinations served. American together with its regional partners operates an extensive international and domestic network with an average of nearly 6,700 flights per day to nearly 350 destinations in more than 50 countries.