Arrangements in which television stations carried more than one network on its main signal (which often resulted in some network programs being not being cleared to air locally by the station, thereby limiting their national carriage and resulting in viewers having to rely on an out-of-market station receivable in their area that airs the locally pre-empted show through an affiliation with that same network in order to see it) were more common between the 1940s and the 1960s, although some arrangements continued as late as 2010.