| Tail Number / N-Number | N4121A |
| Manufacturer | PIPER |
| Model | PA-28-236 |
| Year Built | 1994 |
| Manufacturer's Serial Number | 2811047 |
| Aircraft Type | Fixed wing single engine |
| 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 | 0-540 SERIES |
| Engine Type | Reciprocating |
| Number of Engines | 1 engine |
| Horsepower | 250 hp (187 kW) |
| Type of Registrant | LLC |
| Owner Name | AIRJOHN LLC |
| Street | 1712 PIONEER AVE |
| City | CHEYENNE |
| State | WY |
| Zip Code | 82001-4406 |
| Region | Northwest Mountain |
| County | Laramie County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Standard |
| Airworthiness Date | 1994-06-09 |
| Certificate Issue Date | 2021-11-23 |
| Last Action Date | 2021-11-23 |
| Expiration Date | 2028-11-30 |
| Status | Valid Registration |
| Mode S Code | 51157012 |
| Mode S Code Hex | A4DE0A |