The first chart is my example of what the basic research tree looks like on a recent play through. You may find differences in the route you take to unlock research.

I have named 7 tiers of research for illustration purposes. The different colours are for visual effect and don't indicate anything.
It appears Flight V is always the last to unlock on this tree no matter which way you research it.



The advanced research tree has 5 tiers. Unfortunately, the chart I placed here will no longer publish.


Any errors in this guide are open to correction.