| Tail Number / N-Number | N321ST |
| Manufacturer | MIKOYAN GUREVICH |
| Model | MIG 21 |
| Manufacturer's Serial Number | 07695165 |
| 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) |
| Number of Engines | 1 engine |
| Type of Registrant | LLC |
| Owner Name | ULTIMATE AVIATION LLC |
| Other Names |
|
| Street | 1780 N 2000 W STE 23 |
| City | BRIGHAM CITY |
| State | UT |
| Zip Code | 84302-4020 |
| Region | Northwest Mountain |
| County | Box Elder County |
| Country | US |
| Fractional Ownership | No |
| Certificate Issue Date | 2021-09-20 |
| Last Action Date | 2021-09-20 |
| Expiration Date | 2028-09-30 |
| Status | Valid Registration |
| Mode S Code | 50671651 |
| Mode S Code Hex | A373A9 |
Deregistered Aircraft 1 of 1. This aircraft was previously assigned the N-number N321ST.
| Tail Number / N-Number | N321ST |
| Manufacturer | MITSUBISHI |
| Model | MU-2B-25 |
| Manufacturer's Serial Number | 307 |
| Aircraft Type | Fixed wing multi engine |
| Category | Land |
| Builder Certification | Type Certificated |
| Number of Seats | 10 seats |
| Weight Class | CLASS 1 (Up to 12,499 pounds gross take off weight) |
| Number of Engines | 2 engines |
| Average Cruising Speed | 156 miles per hour |
| Type of Registrant | Individual |
| Owner Name | DIAMOND DAVID L DBA |
| Other Names |
|
| Street | 2335 WATERGATE WAY |
| City | KENAI |
| State | AK |
| Zip Code | 99611 |
| County | Box Elder County |
| Country | US |
| Certificate Issue Date | 1985-03-14 |
| Last Action Date | 1994-08-19 |
| Last Status | A second attempt has been made at mailing a Triennial Aircraft Registration form to the owner with no response |
| Cancellation Date | 1997-02-20 |