From WHAT REALLY HAPPENED:
This appears to be an experimental hypersonic "wave rider" aircraft of some kind, similar to the Aurora.
It is flying high enough to still be in sunlight making the exhaust seem to glow. Because the rate of expansion of the exhaust is seen to slow down, the vehicle is within the upper atmosphere.
That it is flying in sunlight over a major city does suggest this is an intentional display of some kind as normally such experimental craft are flight tested away from prying eyes.
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