NBC is mulling a scheduling shakeup that would put comedian Jay Leno back on late-night TV and put an end to the experiment that brought the talk show host to prime-time. A person familiar with discussions held Thursday said the network is considering a scenario that would include a half-air Leno show at 11:35 P.M. (0435 GMT), pushing “The Tonight Show” with Conan O'Brien to 12:05 (0505 GMT) and Jimmy Fallon's “Late Night” to 1:05 A.M. (0605 GMT). Leno's nightly 10 P.M. EST (0300 GMT) talk and comedy show has drawn lackluster ratings and complaints from NBC affiliate stations that the show has been a weak lead-in for local late newscasts and hurt their viewership. The proposed new lineup could go into effect after NBC concludes its Olympics coverage at the end of February.