Hi, I had the same issue, which i sort of 'solved' by using 2 mods that intergrate rover and plane parts into the tech tree. If you install the mods and possibly delete parts of no intrested gives a tech progression of more like trucks->prop aircraft & basic rockets->jet aircraft->advanced rockets. Note not sure if both updated for 0.90 yet. Modular MultiWheels - start tech can build truck style rovers, more advanced stuff spead over tech tree Firespitter - Propopella aircraft at early tech