| Tail Number / N-Number | N491SF |
| Manufacturer | CESSNA |
| Model | 172S |
| Year Built | 2003 |
| Manufacturer's Serial Number | 172S9565 |
| 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 | Corporation |
| Owner Name | SNOHOMISH FLYING SERVICE INC |
| Street | 9900 AIRPORT WAY |
| City | SNOHOMISH |
| State | WA |
| Zip Code | 98296-8260 |
| Region | Northwest Mountain |
| County | Snohomish County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Standard |
| Airworthiness Date | 2003-12-18 |
| Certificate Issue Date | 2004-01-26 |
| Last Action Date | 2021-12-09 |
| Expiration Date | 2029-04-30 |
| Status | Valid Registration |
| Mode S Code | 51412545 |
| Mode S Code Hex | A61565 |