What wheel-based metaphor commonly describes centralized transport and distribution systems, notably airports?
Transport hub it important for airports to be connected to the surrounding transport infrastructure, including roads, bus services, and railway and rapid transit systems. Secondly some airports function as intra-modular hubs for the airlines, or airline hubs. This is a common strategy among network airlines who fly only from limited number of airports and usually will make their customers change planes at one of their hubs if they want to get between two cities the airline doesn't fly directly between. Airlines have extended the hub-and-spoke model in various ways. One method is to create additional hubs on a regional basis, and to
Metaphor Computer Systems own company, Sequence Support Services. In May 1992, Sequence Support Services ceased operations. In October 1994, Metaphor ceased operations. Metaphor Computer Systems Metaphor Computer Systems (1982–1994) was a Xerox PARC spin-off that created an advanced workstation, database gateway, a unique graphical office interface, and software applications that communicate. The Metaphor machine was one of the first commercial workstations to offer a complete hardware/software package and a GUI. Although the company achieved some commercial success, it never achieved the fame of either the Apple Macintosh or Microsoft Windows. David Liddle and Donald Massaro founded Metaphor in 1982 after leaving Xerox PARC.