| Tail Number / N-Number | N138JG |
| Manufacturer | CESSNA |
| Model | 421B |
| Year Built | 1975 |
| Manufacturer's Serial Number | 421B0952 |
| Aircraft Type | Fixed wing multi engine |
| Category | Land |
| Builder Certification | Type Certificated |
| Number of Seats | 8 seats |
| Weight Class | CLASS 1 (Up to 12,499 pounds gross take off weight) |
| Engine Manufacturer | CONT MOTOR |
| Engine Model | GTSI0-520-F-K |
| Engine Type | Reciprocating |
| Number of Engines | 2 engines |
| Horsepower per Engine | 435 hp (325 kW) |
| Total Horsepower | 870 hp (649 kW) |
| Average Cruising Speed | 172 miles per hour |
| Type of Registrant | Corporation |
| Owner Name | TRAMARK AVIATION L L C |
| Street | 5051 BETHEL CHURCH RD |
| City | SALINE |
| State | MI |
| Zip Code | 48176-9728 |
| Region | Great Lakes |
| County | Washtenaw County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Standard |
| Airworthiness Date | 1975-08-19 |
| Certificate Issue Date | 1999-02-04 |
| Last Action Date | 2022-05-15 |
| Expiration Date | 2029-10-31 |
| Status | Valid Registration |
| Mode S Code | 50114670 |
| Mode S Code Hex | A099B8 |