| Tail Number / N-Number | N621CG |
| Manufacturer | ALEXANDER SCHLEICHER GMBH & CO |
| Model | ASK 21 |
| Year Built | 2009 |
| Manufacturer's Serial Number | 21861 |
| Aircraft Type | Glider |
| 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 | AMA/EXPR |
| Engine Model | UNKNOWN ENG |
| Number of Engines | 0 engines |
| Type of Registrant | Corporation |
| Owner Name | CHICAGO GLIDER CLUB |
| Street | 26045 W AIRPORT RD |
| City | MINOOKA |
| State | IL |
| Zip Code | 60447-9221 |
| Region | Great Lakes |
| County | Grundy County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Standard |
| Airworthiness Date | 2010-04-16 |
| Certificate Issue Date | 2009-11-13 |
| Last Action Date | 2021-08-11 |
| Expiration Date | 2029-01-31 |
| Status | Valid Registration |
| Mode S Code | 52015055 |
| Mode S Code Hex | A81A2D |