I was just thinking the other day that there were only four All-News stations with live and local programming 24/7: KNX, KCBS, WINS and WTOP. The other All-News stations do prerecorded news overnight with a live traffic reporter every ten minutes. Actually WBBM Chicago even prerecords its traffic, only using planned-ahead-of-time construction and only a few times each hour, not every ten minutes. If a tanker truck overturns on the Dan Ryan Expressway overnight, there's nobody at WBBM to report that.
The Canadian All-News stations are sort of doing what KNX and KCBS are doing, using one live anchor overnight for CFTR Toronto, CKWX Vancouver and a few Canadian stations that do All-News sometimes with talk shows at other times.
Among Sports stations, I think only WFAN and WSCR Chicago have live and local sports talk shows all night. And I don't think there are any live and local overnight Talk Radio shows now. WABC comes close. On weeknights, Lionel is syndicated to several other stations from 1 to 5 a.m. But WABC has a local show just for NYC on weekend overnights.
It is sad how overnight live radio programming is de-evolving.