The current version of NBC News Radio should still have at least some major-market affiliates. In New York, I'm pretty sure that it was airing on WOR before the station was sold. In some cases (like down here in D.C.), it may be bundled with CBS Radio News, so that the NBC newscasts would air one station (in this example, WFED), while the CBS newscasts would air on a co-owned station (here, WTOP).
The big question mark right now, though, is what will happen when Cumulus closes on its purchase of the current WestwoodOne (formerly Dial Global): Westwood handles CBS and NBC, while Cumulus still handles ABC News Radio--although that deal may be expiring within the next year or so.
