| Tail Number / N-Number | N4221 |
| Manufacturer | CESSNA |
| Model | 172RG |
| Year Built | 1979 |
| Manufacturer's Serial Number | 172RG0019 |
| 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 | O&VO-360 SER |
| Engine Type | Reciprocating |
| Number of Engines | 1 engine |
| Horsepower | 180 hp (134 kW) |
| Type of Registrant | Individual |
| Owner Name | POPE WILLIAM A |
| Street | 2145 FM 2328 |
| City | ATLANTA |
| State | TX |
| Zip Code | 75551-6903 |
| Region | Southwestern |
| County | Cass County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Standard |
| Airworthiness Date | 1979-09-10 |
| Certificate Issue Date | 2022-10-19 |
| Last Action Date | 2022-10-19 |
| Expiration Date | 2029-10-31 |
| Status | Valid Registration |
| Mode S Code | 51202610 |
| Mode S Code Hex | A50588 |
Deregistered Aircraft 1 of 1. This aircraft was previously assigned the N-number N4221.
| Tail Number / N-Number | N4221 |
| Manufacturer | FAIRCHILD |
| Model | FH-227B |
| Year Built | 1967 |
| Manufacturer's Serial Number | 527 |
| Aircraft Type | Fixed wing multi engine |
| Category | Land |
| Builder Certification | Type Certificated |
| Number of Seats | 61 seats |
| Weight Class | CLASS 3 (20,000+ pounds gross take off weight) |
| Number of Engines | 2 engines |
| Average Cruising Speed | 225 miles per hour |
| Type of Registrant | Corporation |
| Owner Name | OZARK AIR LINES INC |
| Street | PO BOX 10007 LAMBERT FIELD |
| City | ST LOUIS |
| State | MO |
| Zip Code | 63145 |
| Region | Central |
| County | Cass County |
| Certificate Issue Date | 1974-08-28 |
| Last Status | Valid Registration |
| Cancellation Date | 1980-08-11 |
| Exported To | FRANCE |