| Tail Number / N-Number | N804KL |
| Manufacturer | SCHLEICHER |
| Model | ASK-21 |
| Year Built | 1984 |
| Manufacturer's Serial Number | 21235 |
| Aircraft Type | Glider |
| Category | Land |
| Builder Certification | Type Certificated |
| Number of Seats | 2 seats |
| Weight Class | CLASS 1 (Up to 12,499 pounds gross take off weight) |
| Engine Manufacturer | NONE |
| Engine Model | NONE |
| Number of Engines | 0 engines |
| Type of Registrant | LLC |
| Owner Name | HOLLISTER SOARING CENTER LLC |
| Street | 90 SKYLANE DR STE 101 |
| City | HOLLISTER |
| State | CA |
| Zip Code | 95023-2549 |
| Region | Western-Pacific |
| County | San Benito County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Experimental |
| Airworthiness Date | 1989-04-19 |
| Certificate Issue Date | 2016-10-17 |
| Last Action Date | 2022-05-13 |
| Expiration Date | 2029-10-31 |
| Status | Valid Registration |
| Mode S Code | 52570645 |
| Mode S Code Hex | AAF1A5 |