| Tail Number / N-Number | N123MJ |
| Pending N-Number Change | N477K |
| Manufacturer | LEARJET INC |
| Model | 23 |
| Year Built | 1965 |
| Manufacturer's Serial Number | 23036 |
| Aircraft Type | Fixed wing multi engine |
| Category | Land |
| Builder Certification | Type Certificated |
| Number of Seats | 8 seats |
| Weight Class | CLASS 2 (12,500 - 19,999 pounds gross take off weight) |
| Engine Manufacturer | GE |
| Engine Model | CJ610-SER |
| Engine Type | Turbo-jet |
| Number of Engines | 2 engines |
| Horsepower per Engine | 2,700 hp (2,014 kW) |
| Total Horsepower | 5,400 hp (4,028 kW) |
| Average Cruising Speed | 315 miles per hour |
| Type of Registrant | LLC |
| Owner Name | LEARJET 23 LLC |
| Street | 3511 SILVERSIDE RD STE 105 |
| City | WILMINGTON |
| State | DE |
| Zip Code | 19810-4902 |
| Region | Eastern |
| County | New Castle County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Standard |
| Airworthiness Date | 1965-07-16 |
| Certificate Issue Date | 2021-06-15 |
| Last Action Date | 2021-06-15 |
| Expiration Date | 2028-06-30 |
| Status | Valid Registration |
| Mode S Code | 50057763 |
| Mode S Code Hex | A05FF3 |