<P> Similarly, media coverage of New Year's Eve celebrations in New York City often leave the Central Time Zone out . Late Night with Conan O'Brien, though produced in New York City, when broadcast on New Year's Eve took advantage of its later time slot (11: 37 p.m. Central time) to lampoon this inconsistency by presenting a New Year's celebration for the Central Time Zone . In some locations, New Year's Eve celebrations held in New York might be repeatedly performed live or delayed one hour to correspond to the Central Time Zone . News channels such as CNN and sports channels such as ESPN that frequently broadcast live events offer a single feed that airs in all time zones . About 80 percent of the U.S. population reside in the Central and Eastern time zones, where the nation's largest city (and the main anchor of television programming) New York is located . </P> <P> With the revived prominence of live television as a major broadcast format in the U.S. in recent decades, networks have resorted into airing live shows by repeated live performances of the telecasts, or a single telecast in real time simultaneously across U.S. time zones . </P> <P> Occasionally, networks will produce and broadcast the same live event twice in one night - broadcasting once on an East Coast feed, and again on a West Coast feed three hours later . This permits more viewers to watch the broadcast live in prime time (although not all), as the show can air in its usual timeslot in all markets, but incurs the expense and difficulty of delivering two live broadcasts . In some cases, the two broadcasts may intentionally differ, prompting fans to compare notes and post scenes from each version online . While rare, the technique of multiple live broadcasts has been not uncommon for some special live episodes of scripted programs since the late 1990s, such as the 30 Rock episodes "Live Show" and "Live from Studio 6H", Will & Grace with "Alive and Schticking", The West Wing with "The Debate", and ER's fourth - season debut with "Ambush". </P> <P> Few regularly scheduled prime time shows, both scripted and non-scripted, and sports and non-sports in genre, have been aired to totality at the same time live across all continental U.S. time zones . This format, similar to aforementioned major awards shows, involves airing live on prime time or late night in the East Coast (and late afternoon hours or on prime time, simultaneously and respectively, on the West Coast). As of 2018, NBC remains the foremost proponent of live television, with its broadcasts of Sunday Night Football and Saturday Night Live being transmitted live across the contiguous U.S. states (and for the former, including for U.S. time zones outside the mainland), with a corresponding prime time or late - night encore for viewers outside the Eastern and Central time zones . </P>

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