I think it's a Boeing 737 silhouetted in plan view, i.e. directly overhead. Nowhere was the eclipse directly overhead.
I then used the knowledge that the aircraft would have been flying at a height of 35 to 39,000 feet and with a bit of simple trigonometry, the apparent angular size was too big for the sun/moon diameter of about 0.5 degrees. I'm not particularly into statistics, but the chance of an aircraft happened to pass directly in front of the sun during the moment of total eclipse is infinitesimally small.
I think you people know that I am a retired airline pilot. In a long career, I only once saw a distant aircraft pass directly in front of the sun (as it happened, I was on the ground at a cricket match!) And on that occasion, of course, the sun wasn't eclipsed.
So the odds are so long that I have to be suspicious about that 'photo'.
And here's 'me' on a mobility scooter. Believe that if you like:-)
Jack