[BBury]

The only time one should see flames out the back of a jet engine is with an afterburner. The early jet engines tended to have minimal flame during start and at the most light blue and orange flame at very high power settings but not nearly as intense as what is in the game. It should be nearly impossible to see from any distance in the air unless you're flying right up the tail pipe. From a mechanical standpoint it is not good to have flame touching the turbine blades, or any other interior parts of the engine.