American Airlines is a major airline headquartered in Fort Worth, Texas, and is the largest airline in the world by scheduled passengers carried, American Airlines customer service revenue passenger mile, and fleet size. It operates an extensive network of almost 6,800 flights per day to nearly 350 destinations in 48 countries, both internationally and domestically, along with its regional partners and affiliates. American Airlines is a founding member of the Oneworld alliance, and its regional service is operated by independent and subsidiary carriers under the brand name American Eagle. The airline operates out of 10 hubs, with Dallas/Fort Worth International Airport (DFW) being its largest.