Hmm.... not sure what I have here... on 1710 at 2230 UTC I heard an OM speaking in a Slavic language, very strong signal, for a few seconds, then it vanished. Then at about 2232 UTC he came back on, sounded like the same OM but in English, and said something along the lines of Christmas Greetings, then gone again.
Now at 2235 I am hearing the Flight 93 TIS station. I'm quite pleased to NOT be hearing the Hudson County TIS (I hope I did not just jinx myself). I'll leave the SDR recording and see what else turns up.
I just remembered I started the SDR recording when I heard it, so I have a partial recording:
http://www.radiohobbyist.org/blog/mypics/1709.8-AM-15-Dec-2019-22.30.46.mp4