I discovered some old scanner audio. The date is 06/02/2010. It is a bit confusing even for me and I recorded it. There is a plane with callsign
Bully70 or perhaps Bowie70. It self identifies as a Janet C-12 by mistake. But I hear two different voices with the same callsign for Bully70. Later
on NASA926 shows up. That is the high altitude WB-57. I also hear callsign Coffee Tree, though I can't say if it is a plane.
The file in question is the 2nd link (at the time of this posting). I made it a high quality m4a, so it may not stream well on a slow Internet
connection. You can right click to save the file.