American Airlines is the biggest airline globally based on seat volume. Year on year seat growth takes into account of the transfer of US Airways which was merged in to American Airlines. Out of the world's top 20 carriers American Airlines has the second largest number of aircraft currently on order, they are a founding member of the Oneworld Airline Alliance which is the third largest airline alliance in the world. American Airlines top three hubs: Dallas Fort Worth (IATA Code DFW) Number of seats operating from DFW is: 32,789,312 they hold 84.80% of the airports overall capacity and serve 204 routes. Charlotte (IATA Code CLT) Number of seats operated by American Airlines is: 24,763,989 and they hold 90.8% of the airports overall capacity and serve 153 routes. Miami (IATA Code MIA) Number of seats: 32,789,312 they hold 67.7% of the airports overall capacity and serve 134 routes. Overall American Airlines number one route is a domestic service from LGA-ORD where they have an average of 2,504 bookings per day. Average number of seats per aircraft 109 Average Load Factor 80% Average Flight Length 2.23 Countries Served 57, 83% Domestic and 17% international, American Airlines aircraft has an average age of 10.3 years which makes them have the youngest fleet of US carriers.