As you know, . Dallas Fort Worth is its busiest hub and the world's . Between , the US DOT data shows that the world airline carried 24.8 million roundtrip passengers to/from its Dallas hub on 235+ non-stop routes. But where did passengers go? Being a hub, transit passengers are crucial for in Dallas. I love hub-and-spoke operations, which combine many spokes to make vast numbers of origins and destinations (O&Ds). For example, passengers can fly American from Kansas City to 230+ destinations via . It means many flights, routes, and interconnectedness – and Dallas is a brilliant example. The diversity of aircraft types for the different markets and lengths of haul, and the coordinated nature of schedules for connectivity, often mean multiple periods of considerable activity. For American, it has various 'waves' of flights a day, each comprising one departure bank and one arrival bank, as shown above. This is key in frequency, usability, competitiveness, and total available O&Ds. Relating US DOT T-100 data to booking information for indicates that roughly 63% of American's Dallas passengers transited through the hub. Put another way, ~104,000 people connected there daily. : for my weekly new routes newsletter. Breaking down the 15.7 million transit passengers suggests that just over nine million were domestic. With ~2.3 million, the US to/from Mexico was the next biggest market, then Canada-US, Costa Rica-US, and Guatamala-US. This January-May, more passengers transited over the Texas hub between Tucson and Washington Reagan than anywhere else. Doing so only added 10 miles (16 km) to what a non-stop would be. American carried ~19,200 passengers (127 daily), with the top 10 shown on the map below and in the following table. This is at the airport level. At the city level, Los Angeles-New York was, not surprisingly, the most popular, closely followed by Albuquerque-New York. American had more than 1,600 O&Ds with 2,000+ passengers (13+ daily), an eye-watering number, showing just how powerful its Dallas hub is. While the most popular 10 had 147,000 passengers, they accounted for just 0.94% of the connecting volume. In other words, just one in 106 passengers flew them. This nicely shows how huge hubs typically revolve around many O&Ds and are not overly reliant on a few markets, spreading the risk. Rank Airport level O&Ds . daily passengers via Dallas Find flights 1 Tucson-Washington Reagan 19,200 2 Norfolk-San Diego 19,100 3 Albuquerque-Washington Reagan 16,000 4 Orlando-Orange County 15,100 5 Philadelphia-San Antonio 13,800 6 Las Vegas-Cancun 13,600 7 Albuquerque-New York LaGuardia 12,700 8 New Orleans-San Diego 12,500 9 San Diego-Tampa 12,400 10 Omaha-Cancun 12,300