[Tolsti2]

It would be the world’s slowest rocket for sure. The plume in the video doesn’t move like a real one either. It’s clearly a reflective jet.

http://www.youtube.com/watch?v=gFKcMd8AME0

These things get up high enough so that the plume changes color/shape entirely after just a minute or so, not hover around like a contrail as this ‘mystery’ ones.

It’s just an amazing optical illusion and the timing was perfect to get that angle to look how it does.

[Errant]

I agree. The appearance of flame is probably the sun reflecting off the underside of the wings and body. Amazingly similar but the speed is what leads me to believe it is an aircraft or like you say, the slowest rocket/missile in the world.