Burroughs does not mention this soaring flight...
Correct in that I believe there was no published confirmation of same from Burroughs.
However, there is now - from the recently rediscovered and long- correspondence with Burroughs, some 20 years ago, I am still working through:
"As far as Penniston goes from the moment it happened he stated to both Cabansag and I that he thought that it was a structed craft not just lights. One of the first thing's he stated after the lights lifted off and went up into the air and disapeared is we just saw a UFO".
"As far as the lighthouse goes the statement's that everybody made such a big deal about ...and if you stop and think about it nobody asked us if we ever followed the lighthouse beam. What I mean by that is we did follow a light not knowing what it was but we at no time did we feel that it was the object we first saw. We had lost contact with the object we first saw and wanted to see what the flasing light in the distance was".
Burroughs has always remained clear that he never observed a structured object, only lights which indicated one must be present.
The sole description we have of an actual aerial vehicle is Penniston's and there are three entirely different sketches of it - the original merely being the box-like drawing which accompanied his formal testimony.
Also, of course, in that testimony and backed up by Chandler's, is the fact Penniston reported over the radio how he was never closer than 50 metres to the object.
Burroughs does not support Penniston's claims of actually examining it at close proximity.
Ultimately, we simply don't know, however it's perfectly clear Penniston had decided from the outset that this 'UFO' with flashing lights was not of terrestrial origin, as he related in 1997 interview with AJS Rayl:
"The technology I felt was too advanced.. I still do to this day.. to be created by our government or a foreign government.
...it's not of any known aircraft that I've ever observed or to date, what I've read about in any technical journal or anything like that".
RAYL: Okay. You've obviously thought about this a lot since it happened. Any ideas at this point what it might have been?
PENNISTON: Honestly, Salley, I have no idea as far as anything.. it's not of any known aircraft that I've ever observed or to date, what I've read about in any technical journal or anything like that.
RAYL: What will it take for your to close the book on this now?
PENNISTON: U.S. government to say what we had that night was of unknown origin. We cannot explain it and that's good enough for me.
(End)
As I believe has now been comprehensively evidenced, there was no basis for anything, 'unworldly'' whatsoever.
That's the foundation for all which followed.