It can seem like a rather simple thing to turn a travel hub into a world renowned restaurant, but this is not so. It can be difficult specifically because it is a travel hub. In some instances this makes for a lot of potential customers. On the other hand, it becomes difficult for the same reason. People that are traveling are in a constant hurry. Some of these people may not have the time to eat. This case for both sides is shown with airports.
There are a lot of restaurants in busy airports. This is a major travel hub. The problem, however, is that people leave from one plane only to hop right on another one. On a smooth traffic day this is how things go. People find themselves running from one gateway to another. This is bad for restaurant business that exists inside of this travel hub.
On the flip side, there are grand opportunities to make up this loss when travelers get delayed. It happens more in certain areas than others, but delays are a daily part of flying. Sometimes the delays can be extremely long. This allows some hubs to establish world renowned restaurants for travelers.