Okay, question for the group. Columbus, GA (KCSG) has a VOR-A (Circling Only) approach https://www.faa.gov/aero_docs/dtpp/1904/00636VA.PDF#nameddest=(CSG) which uses the CSG VORTAC as its FaF. That VORTAC is NOTAMed OTS, and has been for what looks like a long while. The approach itself is active, and continues to be updated. How can that be? How can a VOR approach without an operative VOR continue to be available? Sparing the ability to fly it using a GPS overlay (which also seems redundant, given precision or RNAV approaches available to 3 of the 4 runways), how can that approach still be considered usable? Same thing at Appleton, MN (KAQP), where the NDB Rwy 13 approach (https://www.faa.gov/aero_docs/dtpp/1904/09142N13.PDF#nameddest=(AQP)) is served by the AQP NDB, which is also NOTAMed OTS and appears to have been for a while. Neither approach has an "Approach NA" NOTAM. Are these assumed to be available only to GPS systems as "overlays" since their primary navaids are both OTS and have been for some time? Would ATC still clear pilots for them if requested?