| Tail Number / N-Number | N4KM |
| Manufacturer | MCCARTY K A |
| Model | OSPREY II |
| Year Built | 1988 |
| Manufacturer's Serial Number | KM-1 |
| Aircraft Type | Fixed wing single engine |
| Category | Land |
| Builder Certification | Not Type Certificated |
| Number of Seats | 2 seats |
| Weight Class | CLASS 1 (Up to 12,499 pounds gross take off weight) |
| Engine Manufacturer | LYCOMING |
| Engine Model | 0-320 SERIES |
| Engine Type | Reciprocating |
| Number of Engines | 1 engine |
| Horsepower | 180 hp (134 kW) |
| Type of Registrant | Corporation |
| Owner Name | MUSEUM OF FLIGHT FOUNDATION |
| Street | 9404 E MARGINAL WAY S |
| City | SEATTLE |
| State | WA |
| Zip Code | 98108-4046 |
| Region | Northwest Mountain |
| County | King County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Experimental |
| Airworthiness Date | 1989-04-28 |
| Certificate Issue Date | 1996-12-02 |
| Last Action Date | 2021-09-10 |
| Expiration Date | 2029-01-31 |
| Status | Valid Registration |
| Mode S Code | 51124334 |
| Mode S Code Hex | A4A8DC |
Deregistered Aircraft 1 of 2. This aircraft was previously assigned the N-number N4KM.
| Tail Number / N-Number | N4KM |
| Manufacturer | BEECH |
| Model | V35B |
| Year Built | 1976 |
| Manufacturer's Serial Number | D9919 |
| Aircraft Type | Fixed wing single engine |
| Category | Land |
| Builder Certification | Type Certificated |
| Number of Seats | 6 seats |
| Weight Class | CLASS 1 (Up to 12,499 pounds gross take off weight) |
| Number of Engines | 1 engine |
| Average Cruising Speed | 150 miles per hour |
| Type of Registrant | Corporation |
| Owner Name | KLAMOR CORP |
| Street | 800 DOUGLAS RD |
| City | CORAL GABLES |
| State | FL |
| Zip Code | 33134 |
| Region | Southern |
| County | King County |
| Certificate Issue Date | 1976-08-30 |
| Last Status | Valid Registration |
| Cancellation Date | 1979-01-03 |
| Exported To | GERMANY |
Deregistered Aircraft 2 of 2. This aircraft was previously assigned the N-number N4KM.
| Tail Number / N-Number | N4KM |
| Manufacturer | ENSTROM HELICOPTER CORP |
| Model | 280C |
| Manufacturer's Serial Number | 1023 |
| Aircraft Type | Rotorcraft |
| Category | Land |
| Builder Certification | Type Certificated |
| Number of Seats | 3 seats |
| Weight Class | CLASS 1 (Up to 12,499 pounds gross take off weight) |
| Number of Engines | 1 engine |
| County | King County |
| Last Status | The Triennial Aircraft Registration form was mailed and has not been returned by the Post Office |