Would anyone here be interested in helping analyze this aspect of the footage, particularly the Panasonic NV-GS27 focusing/zoom behavior and whether the observed changes are consistent with an out-of-focus aircraft reflecting sunlight?
I'm not sure much can be done with this, as it's nearly 20 years old. Even if one wanted to try and replicate it, how? These old cameras can be found for $50-$150 here in the US. While this particular model was introduced in 2005, the underlying Mini DV format was from the mid '90s:
External Quote:
DV (from
Digital Video) is a family of
codecs and
tape formats used for storing
digital video, launched in 1995 by a consortium of
video camera manufacturers led by
Sony and
Panasonic. It includes the cassette formats DV, MiniDV
While digital, it was still not a great deal more resolution than the analog systems it replaced:
External Quote:
This results in 480 scanlines per complete frame for the 60 Hz system, and 576 scanlines per complete frame for the 50 Hz system. In both systems the active area contains 720 pixels per scanline, with 704 pixels used for content and 16 pixels on the sides left for digital blanking.
And had some compression:
External Quote:
DV uses
lossy compression of
video while audio is stored uncompressed.
[6] An
intraframe video compression scheme is used to compress video on a frame-by-frame basis with the
discrete cosine transform (DCT).
https://en.wikipedia.org/wiki/DV_(video_format)
In addition to the optical zoom on the camera, it included an 800x digital one as well:
https://www.bhphotovideo.com/c/product/428259-GREY/Panasonic_NVGS27E_NV_GS27E_PAL_Mini_DV.html/specs
Looking at the video, it's being recorded from inside an airliner. As a result, one can see times when the auto-focus tries to focus on the window instead of what's out the window:
We also see what appear to be zoomed in shots of clouds and some coast lines:
While there is some movement, these shots are relatively stable for a hand held camera. However, when the UFO is recorded the movement is extreme. Even when it first appears, there is a lot of shaking:
The more the UFO is zoomed in on, the harder it becomes to keep it in the frame:
This suggests the object is fairly distant and the camera operator is engaging near maximum zoom to record it.
A bright sunny day, a camera operated inside a moving aircraft with marginal resolution, some compression and a nearly maxed out zoom would likely render another aircraft something like this. Especial if it is a white or even unpainted one depending on the livery of the particular airline.
For example, imagine an American Airlines plane from this time period reflecting the sun from the polished aluminum skin:
Not that AA seemed to fly in this area much, it's just an example.
I think as you said, this is likely an out of focus airliner reflecting the sunlight under extreme zoom. Identifying what plane that might have been is likely impossible at this date, 20 years on.