Deregistered Aircraft 1 of 2. This aircraft was previously assigned the N-number N4220A.
| Tail Number / N-Number | N4220A |
| Manufacturer | PIPER |
| Model | L-21A |
| Manufacturer's Serial Number | 18-894 |
| 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) |
| Number of Engines | 1 engine |
| Average Cruising Speed | 97 miles per hour |
| Type of Registrant | Government |
| Owner Name | DEPARTMENT OF THE ARMY |
| Street | PO BOX 58 |
| City | FORT KNOX |
| State | KY |
| Zip Code | 40121 |
| Region | Central |
| Certificate Issue Date | 1968-07-02 |
| Last Status | Valid Registration |
| Cancellation Date | 1981-01-20 |
| Mode S Code | 51202546 |
| Mode S Code Hex | A50566 |
Deregistered Aircraft 2 of 2. This aircraft was previously assigned the N-number N4220A.
| Tail Number / N-Number | N4220A |
| Manufacturer | AIR TRACTOR INC |
| Model | AT-802A |
| Year Built | 2010 |
| Manufacturer's Serial Number | 802A-0369 |
| Aircraft Type | Fixed wing single engine |
| Category | Land |
| Builder Certification | Type Certificated |
| Number of Seats | 2 seats |
| Weight Class | CLASS 3 (20,000+ pounds gross take off weight) |
| Engine Manufacturer | P&W CANADA |
| Engine Model | PT6A-65AG |
| Engine Type | Turbo-prop |
| Number of Engines | 1 engine |
| Horsepower | 1,300 hp (970 kW) |
| Type of Registrant | Corporation |
| Owner Name | JOHNSTON AIRCRAFT SERVICE INC |
| Street | PO BOX 1457 |
| City | TULARE |
| State | CA |
| Zip Code | 93275-1457 |
| Country | US |
| Airworthiness Classification | Restricted |
| Airworthiness Date | 2010-05-24 |
| Last Action Date | 2010-12-20 |
| Last Status | Valid Registration |
| Cancellation Date | 2010-12-20 |
| Exported To | AUSTRALIA |
| Mode S Code | 51202546 |
| Mode S Code Hex | A50566 |