Before you Download go and download Kerbal Aircraft Expansion KAX the Mod because this does use one of the parts.
https://kerbalstuff.com/mod/391/Kerbal Aircraft Expansion (KAX)
The J-31 Mosquito is the best Hyper Sonic jump jet to come out of Skunk works at R.M.A.J Aerospace co, with its 2 Turbo jet's and 4 jump jet's its light and maneuverable.
Action Group: 1 Toggles jump jet's on and off
Action Group: 2 Toggles Turbo jet's on and off
SAS Required
Take off speed: 105 m/s
Landing speed: 88.0 m/s
Max speed: 600 m/s Under 10 000m
Max speed: 1309.9 m/s at 20 000m
Max Altitude: 25 000m