If you have ever flown from a smaller city to somewhere far away, chances are you did not go straight there. You changed planes at a big airport in the middle. That big airport is a hub, and the whole system of routing passengers through it has a name: the hub-and-spoke network. Here is how it works, and why nearly every large airline is built around it.
Picture a bicycle wheel. In the center is the hub, and the spokes reach out to the rim. An airline hub works the same way. The airline picks one or a few large airports as its hubs, then flies passengers in from dozens of smaller cities, the spokes, sorts everyone onto connecting flights, and sends them back out toward their final destinations. Delta built its network around Atlanta, United around hubs like Chicago and Denver, and American around Dallas. Atlanta is the busiest airport in the world by passenger numbers, largely because so many people pass through it without ever leaving the terminal.
The other way to run an airline is point to point, which means flying travelers directly between two cities with no hub in the middle. Southwest is the best-known example in the United States. Point to point is simple and pleasant for passengers, because your trip is a single nonstop flight. The catch is that it only works when enough people want to fly that exact route every day to fill a plane. There is not enough daily demand between most pairs of smaller cities to justify a nonstop, so a pure point-to-point airline can only serve routes that stay busy.
Hubs solve a math problem. Connecting a lot of cities directly would take an enormous number of separate routes, and most of them would fly half empty. Route everything through a hub instead, and each city only needs one flight to that hub to reach the whole network. That gives airlines a few big advantages:
All of that efficiency has a cost, and the traveler often pays it in time. A hub trip usually means a layover: you land, walk or ride to another gate, wait, and board a second plane. That adds hours, and it adds the risk that a delay on the first leg makes you miss the second. A nonstop point-to-point flight avoids all of that, which is why many people will pay a bit more, or drive to a larger airport, to get one.
So the choice usually comes down to this:
Next time you book, look at whether your itinerary is a nonstop or routes through a hub city you did not plan to visit. If you want to know how long each leg will actually take, you can add up the segments with the FlightBeat calculator. It gives you a gate-to-gate estimate for each flight, so you can see how much of your day the connection is really adding.
Neither system is better in every case. Hubs give the whole country access to far-flung places, and point to point gives you the clean nonstop when the demand is there. Knowing which one your ticket uses just helps you plan the day around it.
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