The amount of systems available are determined by your plane’s loadout. A plane like the Tornado ADV will have 6 Systems as an example, but an F-111 would only have 4.
Every aircraft will have the following systems:
- Fuselage. This system is centered around Durability, Handling, and Survivability.
- Engines. This system is centered around Speed, Acceleration, and Fuel.
- Avionics. This system is centered around Radar, Vision, and Countermeasures.
The remaining [weapons] systems will be dictated by your aircraft’s specific loadout.