| Tail Number / N-Number | N121MG |
| Manufacturer | MIKOYAN GUREVICH |
| Model | MIG 21 |
| Year Built | 1978 |
| Manufacturer's Serial Number | 433372128 |
| Aircraft Type | Fixed wing single engine |
| Category | Land |
| Builder Certification | Not Type Certificated |
| Number of Seats | 1 seat |
| Weight Class | CLASS 1 (Up to 12,499 pounds gross take off weight) |
| Engine Manufacturer | AMA/EXPR |
| Engine Model | UNKNOWN ENG |
| Number of Engines | 1 engine |
| Type of Registrant | LLC |
| Owner Name | CAVANAUGH AIR LLC |
| Street | 16885 DALLAS PKWY |
| City | ADDISON |
| State | TX |
| Zip Code | 75001-5215 |
| Region | Southwestern |
| County | Dallas County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Experimental |
| Airworthiness Date | 1995-06-30 |
| Certificate Issue Date | 2016-05-24 |
| Last Action Date | 2021-12-16 |
| Expiration Date | 2029-05-31 |
| Status | Valid Registration |
| Mode S Code | 50054203 |
| Mode S Code Hex | A05883 |