| Tail Number / N-Number | N88821 |
| Manufacturer | GRUMMAN |
| Model | G-21A |
| Year Built | 1942 |
| Manufacturer's Serial Number | 1157 |
| Aircraft Type | Fixed wing multi engine |
| Category | Amphibian |
| Builder Certification | Type Certificated |
| Number of Seats | 8 seats |
| Weight Class | CLASS 1 (Up to 12,499 pounds gross take off weight) |
| Engine Manufacturer | P & W |
| Engine Model | R-985-AN-6B |
| Engine Type | Reciprocating |
| Number of Engines | 2 engines |
| Horsepower per Engine | 400 hp (298 kW) |
| Total Horsepower | 800 hp (597 kW) |
| Average Cruising Speed | 150 miles per hour |
| Type of Registrant | Corporation |
| Owner Name | TONGASS HISTORICAL SOCIETY INC |
| Street | 629 DOCKSTREET |
| City | KETCHIKAN |
| State | AK |
| Zip Code | 99901 |
| Region | Alaskan |
| County | Ketchikan Gateway Borough |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Standard |
| Airworthiness Date | 1965-11-19 |
| Certificate Issue Date | 1993-03-08 |
| Last Action Date | 2022-11-22 |
| Expiration Date | 2030-01-31 |
| Status | Valid Registration |
| Mode S Code | 53037105 |
| Mode S Code Hex | AC3E45 |