Interesting that the aircheck begins, not at the top of the hour, or at :06 past the hour, but later. We hear two features in a row, both several minutes long, one about tattoos, one about Williamsburg Virginia tourism. So I suppose this is at a point in the hour where local stations can opt-out, doing their local news or programming. It seems this aircheck was recorded overnight, so that's why there's only one anchor. Weekdays, NIS had dual anchors during most dayparts but overnights and weekends, one person would anchor solo.
K.M. sort of mentions that some NIS affiliates, especially if they were long-time NBC affiliates, continued to air NBC Network News on the hour, even though most stations used the first six minutes for local news. I live in the NYC market, so I heard 97.1 WNWS, the NYC flagship, and they'd do local news at :00-:06 and :30-:36. But when on vacation in New England, I'd also listen to 970 WCSH Portland. They had been an NBC affiliate since the 1920s, so they continued to air NBC News on the hour, and find other segments of the hour to do their local news and features.
WCSH was one of a few local stations that decided to keep going with local All-News when NIS was discontinued. WPOP Hartford also did it for a few years. And KQV continues to do All-News to this day after they were the Pittsburgh NIS affiliate. Give them credit for continuing the format in Market #26 while all the other All-News stations are in Markets 1-14.
I believe NIS was dark between :00 and :06 but supplied segments during the rest of the hour. So even a low-budget station could simply affiliate with some network, NBC or another, to give them news on the hour, and run NIS the rest of the hour. I only recently learned that NIS was dark on Sunday mornings, so NBC could send spots out on the network lines. I always wondered why WNWS and WCSH did public service or religious programming on Sunday mornings. Didn't they know All-News stations get some of their best ratings on weekend mornings when people were starting their day but the popular Mon.-Fri. morning shows were off for the weekend? The answer was they couldn't run NIS on Sunday mornings.