R&D Tech Tree

R&D viewed as a Tech Tree. This is up to date and has everything included up to the latest version.

Want a specific tech, this tree view will show you the path to take. Tree will be updated as the game is updated.

E&OE.

R&D Overview

R&D is split into three sections:

• Aircraft & Passengers
  
• Fuel
  
• Management

From these three section everything else is unlocked.

For a comprehensive overview of what each tech does and how long it takes to unlock this very comprehensive guide should answer most of your questions.
https://steamcommunity.com/sharedfiles/filedetails/?id=2173485709

Aircraft & Passengers

By far the largest research tree, this will be split into several sections, but all start from the Commercial Licence.

Fuel R&D

Management R&D