| Tail Number / N-Number | N121SX |
| Manufacturer | ROBINSON HELICOPTER COMPANY |
| Model | R44 II |
| Year Built | 2018 |
| Manufacturer's Serial Number | 14147 |
| Aircraft Type | Rotorcraft |
| Category | Land |
| Builder Certification | Type Certificated |
| Number of Seats | 4 seats |
| Weight Class | CLASS 1 (Up to 12,499 pounds gross take off weight) |
| Engine Manufacturer | LYCOMING |
| Engine Model | IO 540 SER |
| Engine Type | Reciprocating |
| Number of Engines | 1 engine |
| Horsepower | 260 hp (194 kW) |
| Type of Registrant | LLC |
| Owner Name | SPRUCE GOOSE LLC |
| Street | PO BOX 2276 |
| City | OKLAHOMA CITY |
| State | OK |
| Zip Code | 73101-2276 |
| Region | Southwestern |
| County | Oklahoma County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Standard |
| Airworthiness Date | 2020-10-06 |
| Certificate Issue Date | 2022-08-17 |
| Last Action Date | 2022-08-17 |
| Expiration Date | 2029-08-31 |
| Status | Valid Registration |
| Mode S Code | 50054417 |
| Mode S Code Hex | A0590F |