The technology level of the jet engine.
| Member | Value | Description |
|---|---|---|
| eIdeal | 0 | Ideal (perfect efficiencies). |
| eLevel1 | 1 | Level 1 (1945-1965). |
| eLevel2 | 2 | Level 2 (1965-1985). |
| eLevel3 | 3 | Level 3 (1985-2005). |
| eLevel4 | 4 | Level 4 (2005-2025). |
| eLevel5 | 5 | Level 5 (2025-2045). |





