Merely a trick of perspective
The appearance of the object “falling” is merely a trick of perspective as aircraft heads over the horizon – it’s not getting lower at all. Here in Somerset you can often see transatlantic flights disappear vertically down over horizon as they’re *climbing* to cruising altitude.
Like there’s a ‘burning’ object at the head.
Effect can be pronounced for a brief period when contrail also scatters light of sunset; because trail furthest from aircraft may not be illuminated as much, there’s usually a brightness gradient along it which makes it look even more like there’s a ‘burning’ object at the head.
Impression of emitting light or ‘flaming’.
Been quite a few of these reports in the British press since lockdown began. These are aircraft, with short contrails, heading west at twilight. They’re high enough that the fuselage can reflect the Sun & the glinting can give the impression of emitting light or ‘flaming’.
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