What is a key feature of a 'hub-and-spoke' network?

A hub-and-spoke network is characterized by its central hub through which all traffic routes, enabling efficient connections and streamlined operations. The key feature that supports this structure is the mix of local and connecting traffic, which allows smaller stations (the spokes) to consolidate their traffic through a central hub. This arrangement optimizes logistics, as larger volumes of traffic can be managed more efficiently at the hub. It also facilitates connections to various destinations, enhancing the overall service network.

In contrast, the other choices present attributes that do not define a hub-and-spoke system. For instance, direct connections among all stations would reflect a mesh network rather than the structured approach of a hub-and-spoke design. Limiting operations to only domestic traffic ignores the flexibility that such networks possess in accommodating international routes, which can also be managed effectively through a central hub. Finally, a minimal reliance on partner hubs would contradict the essence of a hub-and-spoke network that relies heavily on a central hub for connecting various routes efficiently.