Claim: The September 11 attacks involved passenger airplanes.

American Airlines , Inc. -LRB- AA -RRB- , 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 , scheduled passenger-kilometres flown , and 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 .   American Airlines is a founding member of Oneworld alliance , the third largest airline alliance in the world and coordinates fares , services , and scheduling with alliance partners British Airways , Iberia , and Finnair in the transatlantic market and with Cathay Pacific and Japan Airlines in the transpacific market . Regional service is operated by independent and subsidiary carriers under the brand name of American Eagle .   American operates out of ten hubs located in Dallas/Fort Worth , Charlotte , Chicago-O'Hare , Philadelphia , Miami , Phoenix , Washington , DC-National , Los Angeles , New York-JFK , and New York-LaGuardia . American operates its primary maintenance base at Tulsa International Airport in addition to the maintenance locations located at its hubs . Dallas/Fort Worth International Airport is American 's largest passenger carrying hub handling 51.1 million passengers annually with an average of 140,000 passengers daily . The company as of 2015 employs over 113,300 people . Through the airline 's parent company , American Airlines Group , it is publicly traded under NASDAQ : AAL with a market capitalization of over $ 40.99 billion as of 2015 .