Top Speed (on autopilot):
Without Afterburner (95% Throttle) = 767 km/hour (477 mph)
With Afterburner (Full Throttle) = 1533 km/hour (953 mph)

My description of Kingfisher in SimplePlanes:
This oddball speedster is a mash-up of early French jet designs with hunched shoulders, long nose, and wings swept back like it’s always ready to bolt. That’s where the name came from.
It flies pretty fast on its own, but here’s the trick: go full throttle, and it kicks into afterburner mode, blasting past Mach 1 like it’s showing off. Think of it as a special attack, uhh, I mean ability v? Although, it guzzles fuel like it’s free lemonade.
Kingfisher often flies as fast as commercial planes in it's cruising flight state, but whenever at full throttle, it will zoom, swerve, and make people say, "Wait, what was that?".

Third Plane so far, made by Major2004Rex. Aircraft model based off from "Kingfisher" in one of Andrew Dewar's Books (Fighter Jets)

!Kingfisher's original appearance

!Andrew Dewar's description of Kingfisher