| Tail Number / N-Number | N421AG |
| Manufacturer | CESSNA |
| Model | 421C |
| Year Built | 1979 |
| Manufacturer's Serial Number | 421C-0663 |
| 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 | GTSIO-520 SER |
| Engine Type | Reciprocating |
| Number of Engines | 2 engines |
| Horsepower per Engine | 300 hp (224 kW) |
| Total Horsepower | 600 hp (448 kW) |
| Average Cruising Speed | 90 miles per hour |
| Type of Registrant | LLC |
| Owner Name | MCGRAIR LLC |
| Street | 2410 N COMMERCE ST |
| City | ARDMORE |
| State | OK |
| Zip Code | 73401-1356 |
| Region | Southwestern |
| County | Carter County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Standard |
| Airworthiness Date | 1999-08-31 |
| Certificate Issue Date | 2023-01-05 |
| Last Action Date | 2023-01-05 |
| Expiration Date | 2030-01-31 |
| Status | Valid Registration |
| Mode S Code | 51177535 |
| Mode S Code Hex | A4FF5D |
Deregistered Aircraft 1 of 2. This aircraft was previously assigned the N-number N421AG.
| Tail Number / N-Number | N421AG |
| Manufacturer | CESSNA |
| Model | 421C |
| Manufacturer's Serial Number | 421C0843 |
| 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) |
| Number of Engines | 2 engines |
| Average Cruising Speed | 90 miles per hour |
| Type of Registrant | Individual |
| Owner Name | GRECO ALEXANDER A TRUSTEE |
| Street | P O BOX 460700 |
| City | ESCONDIDO |
| State | CA |
| Zip Code | 92046 |
| County | Carter County |
| Country | US |
| Certificate Issue Date | 1990-04-24 |
| Last Action Date | 1995-01-18 |
| Last Status | The Triennial Aircraft Registration form was mailed and has not been returned by the Post Office |
| Cancellation Date | 1995-04-17 |
Deregistered Aircraft 2 of 2. This aircraft was previously assigned the N-number N421AG.
| Tail Number / N-Number | N421AG |
| Manufacturer | CESSNA |
| Model | 421A |
| Year Built | 1969 |
| Manufacturer's Serial Number | 421A-0123 |
| Aircraft Type | Fixed wing multi engine |
| Category | Land |
| Builder Certification | Type Certificated |
| Number of Seats | 7 seats |
| Weight Class | CLASS 1 (Up to 12,499 pounds gross take off weight) |
| Number of Engines | 2 engines |
| Average Cruising Speed | 172 miles per hour |
| Type of Registrant | Corporation |
| Owner Name | A G SPANOS CONSTRUCTION INC |
| Street | 1341 W ROBINHOOD DR |
| City | STOCKTON |
| State | CA |
| Zip Code | 95207 |
| Region | Western-Pacific |
| County | Carter County |
| Certificate Issue Date | 1970-12-21 |
| Last Status | Valid Registration |
| Cancellation Date | 1973-02-12 |
| Exported To | CANADA |