Throw in Raleigh/Durham having a very weak NBC affiliate and both Wilmington and Greenville/New Bern/Washington having very strong NBC affiliates - until the 1990s, WECT used to be de facto NBC for Fayetteville, Lumberton, and Southern Pines while WITN was de facto NBC for Goldsboro, Rocky Mount, and Wilson
I just ordered a 1973 copy of the NC TVG on eBay. It didn't have the multiple network configuration for WWAY and WECT, but it did have a couple of bloopers on the channels listed page, WRET-36 Charlotte was shown with a white bullet and as channel 27 (???), and WNCT was simply called "WNC". I'm assuming that was just the work of some careless setup person, and that WRET appears as channel 36 in the listings. It should be here in a few days.