Airliners do reflect the sunlight very well. You'll notice that in the first part of the video there is no "flame" visible. The "flame" only shows up later when the sky color has deepened to orange and the angle of the sun would have been better for reflecting off the undersides of big aluminium tubes.
Thanks, Dan.
I thought I saw just one flame (reflection), shouldn’t it be more than one, up to four, depending on the jet?