A simple part mod that adds realistic mirage effect into SimplePlanes, to enable, drag the cube object from the propulsion tab off the part list and place it in the desired location. The size of the haze can be customised from the settings tab once the object is selected.
edit: error loading the mod on android, therefore it won't be supported, sorry :(
ps: source code is available as well
Thanks to @MOPCKOEDNISHE for helping me with the scripts :)