sentences:  When the United States airline industry was deregulated in 1978, Delta's hub and spoke paradigm was annexed by several airlines.Many airlines around the world operate hub-and-spoke systems facilitating passenger connections between their respective flights.Intermodal passenger transport hubs in public transport include bus stations, railway stations and metro stations, while a major transport hub, often 
  multimodal (bus and rail), may be referred to as a transport center or, in American English, as a transit center.