| Tail Number / N-Number | N6684U |
| Manufacturer | MOONEY |
| Model | M20J |
| Year Built | 1976 |
| Manufacturer's Serial Number | 24-0036 |
| 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 | I0360 SER |
| Engine Type | Reciprocating |
| Number of Engines | 1 engine |
| Horsepower | 180 hp (134 kW) |
| Average Cruising Speed | 126 miles per hour |
| Type of Registrant | Individual |
| Owner Name | FOWLER KENNETH G |
| Street | 506 MOUNTAIN LAKE RD |
| City | NEWPORT |
| State | TN |
| Zip Code | 37821 |
| Region | Central |
| County | Cocke County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Standard |
| Airworthiness Date | 1976-10-28 |
| Certificate Issue Date | 1995-01-17 |
| Last Action Date | 2022-02-03 |
| Expiration Date | 2029-06-30 |
| Status | Valid Registration |
| Mode S Code | 52152350 |
| Mode S Code Hex | A8D4E8 |