What about if... jet could have two nominal speeds. Normal speed (right mouse button click) as it is now, and turbo-speed (double right mouse button click). Of course turbo-speed jet should use 2x faster (or even 3x etc) fuel. Distance which you can fly with this (faster) speed should be much more smaller than with normal jet speed.
=============================================================
Jet mode | Activate | Speed | Distance (fuel usage)
=============================================================
Normal Jet | Right Mouse Button Click | Normal | Normal (normal fuel usage)
-------------------------------------------------------------------------------------------------
Turbo Jet | Double Right Mouse Button Click | Fast | Short (fast fuel usage)
=============================================================
It`s crazy idea... but... : -)