A change I would like to see to some pre-requisites in the lighter-than-air tech category.
Military airship prototype should just have a pre-requisite of the Dirigible Airship (Shoul.d prevent some countries from having this tech, but not its pre-requisites.)
Airship bomb release mechanism: basic airship bomb
Airship bomb aiming techniques: basic airship bomb and airship bomb release
Military Airship: Military airship prototype, basic airship bomb, and airship bomb aiming techniques.
Military airship prototype should just have a pre-requisite of the Dirigible Airship (Shoul.d prevent some countries from having this tech, but not its pre-requisites.)
Airship bomb release mechanism: basic airship bomb
Airship bomb aiming techniques: basic airship bomb and airship bomb release
Military Airship: Military airship prototype, basic airship bomb, and airship bomb aiming techniques.