4/24/2023 1059 UTC KJI955 1640 kHz with repeating ID loop. This is supposedly a TIS at the CIA Langley headquarters that does not appear in any FCC nor NTIA databases.
4/24/2023 1059 UTC WRBM347 1640 kHz National Airport DC mixing in with KJI955
4/24/2023 1101 UTC WQKP521 1630 kHz Berks County PA State highway TIS
I hope to update this list as I go through the SDR recordings some more...