| Tail Number / N-Number | N21591 |
| Manufacturer | CESSNA |
| Model | 172S |
| Year Built | 2004 |
| Manufacturer's Serial Number | 172S9658 |
| 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 | IO-360-L2A |
| Engine Type | Reciprocating |
| Number of Engines | 1 engine |
| Horsepower | 180 hp (134 kW) |
| Type of Registrant | LLC |
| Owner Name | KOHN AVIATION LLC |
| Street | 108 WILDWOOD AVE |
| City | SAN CARLOS |
| State | CA |
| Zip Code | 94070-4517 |
| Region | Western-Pacific |
| County | San Mateo County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Standard |
| Airworthiness Date | 2004-06-29 |
| Certificate Issue Date | 2018-08-24 |
| Last Action Date | 2021-08-23 |
| Expiration Date | 2028-08-31 |
| Status | Valid Registration |
| Mode S Code | 50347702 |
| Mode S Code Hex | A1CFC2 |
Deregistered Aircraft 1 of 1. This aircraft was previously assigned the N-number N21591.
| Tail Number / N-Number | N21591 |
| Manufacturer | CESSNA |
| Model | 172M |
| Year Built | 1974 |
| Manufacturer's Serial Number | 17263980 |
| 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) |
| Number of Engines | 1 engine |
| Average Cruising Speed | 108 miles per hour |
| Type of Registrant | Corporation |
| Owner Name | STANLEYS TRUCK & AUTO REPAIRS INC |
| Street | 5720 NW 35 AVE |
| City | MIAMI |
| State | FL |
| Zip Code | 33142 |
| Region | Southern |
| County | San Mateo County |
| Country | US |
| Certificate Issue Date | 1976-10-18 |
| Last Status | Valid Registration |
| Cancellation Date | 1980-09-11 |