American Airlines is a major airline in the United States headquartered in Fort Worth, Texas, within the Dallas–Fort Worth metroplex. It is the largest airline in the world when measured by scheduled passengers carried, revenue passenger mile, and daily flights. American, along with its regional subsidiaries and contractors operating under the brand name American Eagle, operate an extensive international and domestic network with almost 6,800 flights per day to nearly 350 destinations in 48 countries. American Airlines is a founding member of the Oneworld alliance.