| Tail Number / N-Number | N921SK |
| Manufacturer | MOONEY |
| Model | M20R |
| Year Built | 1997 |
| Manufacturer's Serial Number | 29-0118 |
| Aircraft Type | Fixed wing single engine |
| Category | Land |
| Builder Certification | Type Certificated |
| Number of Seats | 2 seats |
| Weight Class | CLASS 1 (Up to 12,499 pounds gross take off weight) |
| Engine Manufacturer | CONT MOTOR |
| Engine Model | IO-550 SERIES |
| Engine Type | Reciprocating |
| Number of Engines | 1 engine |
| Horsepower | 300 hp (224 kW) |
| Type of Registrant | LLC |
| Owner Name | SEPTEMBER 21 LLC |
| Street | 438 ROBINS ST |
| City | TUPELO |
| State | MS |
| Zip Code | 38804-3757 |
| Region | Southwestern |
| County | Lee County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Standard |
| Airworthiness Date | 1997-06-30 |
| Certificate Issue Date | 2018-10-04 |
| Last Action Date | 2021-05-23 |
| Expiration Date | 2028-10-31 |
| Status | Valid Registration |
| Mode S Code | 53141573 |
| Mode S Code Hex | ACC37B |