| Tail Number / N-Number | N9921D |
| Manufacturer | PIPER |
| Model | PA-18 |
| Year Built | 1959 |
| Manufacturer's Serial Number | 18-6963 |
| 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 | C90 SERIES |
| Engine Type | Reciprocating |
| Number of Engines | 1 engine |
| Horsepower | 95 hp (71 kW) |
| Average Cruising Speed | 97 miles per hour |
| Type of Registrant | Individual |
| Owner Name | DISCHER STEPHEN R |
| Street | 706 PUTTER CT |
| City | COLLEGE STATION |
| State | TX |
| Zip Code | 77845-8997 |
| Region | Southwestern |
| County | Brazos County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Standard |
| Airworthiness Date | 1959-04-24 |
| Certificate Issue Date | 2020-02-21 |
| Last Action Date | 2022-11-08 |
| Expiration Date | 2030-02-28 |
| Status | Valid Registration |
| Mode S Code | 53356220 |
| Mode S Code Hex | ADDC90 |