So like when you go to info you can get a readout of theoretical top speed, turn radius, and run time till empty fuel. Those were some ideas I just thought of after reading this. Most likely, that would have to be a PC only feature, calculations like that would probably crash some phones.

A more in-depth variation of the info button in the design menu with virtual wind tunnels and various testing softwares which verify the aircrafts ability to fly according to the real world laws of physics.