text: Production and scheduling Late Night originated from NBC Studio 6A at the RCA (later GE) Building at 30 Rockefeller Plaza in New York City. The program ran four nights a week, Monday to Thursday, from the show's premiere on February1, 1982, until June4, 1987. Friday shows were added on June12, 1987, although the show still only produced four new episodes a week. Monday's shows were re-runs. NBC previously aired Friday Night Videos in the 12:30 a.m. slot on Saturday morning, with occasional Late Night specials and reruns. Friday Night Videos was reduced to an hour's length and moved up an hour to 1:30 a.m. on Saturday morning.
  Starting on September2, 1991, The Tonight Show Starring Johnny Carson was pushed back from 11:30 p.m. to 11:35 p.m., with Letterman starting at 12:35 a.m., at the request of NBC affiliates who wanted more advertising time for their profitable late newscasts.
  Like The Tonight Show in the 1980s and early 1990s, Late Night aired annual anniversary specials. They aired on or about February1, first in its own timeslot (albeit on a Friday, preempting SCTV). From 1984 to 1987, episodes of Saturday Night Live were preempted for the special. Finally, from 1988 to 1990 and in 1992, the special aired in prime time, after Cheers. There were no anniversary specials in 1991 and 1993. (Letterman would leave NBC later in 1993.) David Letterman's Holiday Film Festival also aired in Saturday Night Lives timeslot over Thanksgiving weekend in 1985, before a second and final installment aired in prime time the Friday after Thanksgiving in 1986. The festivals were a collection of shorts starring, directed and/or written by celebrities.