The portmanteau NYLON, also spelled NYLon or, less often, NY-Lon, starts with the concept of New York City and London as twin cities – the financial and cultural capitals of the English-speaking world – and takes the concept a step further, treating the two cities as "a single city separated by an ocean". There is a community of high-earning professionals who commute with extreme frequency – sometimes several days in a given week – between New York and London on transatlantic flights.
To satisfy the tastes of this particular community, businesses such as Time Out and Conran have branches in both cities. The theatre industries of both cities are also sometimes said to be closely related and/or collaborative: most shows originating in London's West End circulate through Broadway theater and vice versa, for example.