| Tail Number / N-Number | N121LJ |
| Manufacturer | LEARJET INC |
| Model | 31A |
| Year Built | 1996 |
| Manufacturer's Serial Number | 121 |
| Aircraft Type | Fixed wing multi engine |
| Category | Land |
| Builder Certification | Type Certificated |
| Number of Seats | 10 seats |
| Weight Class | CLASS 2 (12,500 - 19,999 pounds gross take off weight) |
| Engine Manufacturer | GARRETT |
| Engine Model | TFE731 SERIES |
| Engine Type | Turbo-fan |
| Number of Engines | 2 engines |
| Thrust per Engine | 3,500 pounds-force (15.6 kN) |
| Total Thrust | 7,000 pounds-force (31.1 kN) |
| Type of Registrant | LLC |
| Owner Name | N121LJ LLC |
| Street | 360 MAIN ST |
| City | ELMIRA |
| State | NY |
| Zip Code | 14904 |
| Region | Eastern |
| County | Chemung County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Standard |
| Airworthiness Date | 1996-05-03 |
| Certificate Issue Date | 2021-08-19 |
| Last Action Date | 2021-08-19 |
| Expiration Date | 2028-08-31 |
| Status | Valid Registration |
| Mode S Code | 50054154 |
| Mode S Code Hex | A0586C |