| Tail Number / N-Number | N2121F |
| Manufacturer | CESSNA |
| Model | 172S |
| Year Built | 2007 |
| Manufacturer's Serial Number | 172S10437 |
| Aircraft Type | Fixed wing single engine |
| Category | Land |
| Builder Certification | Type Certificated |
| Number of Seats | 4 seats |
| Weight Class | CLASS 1 (Up to 12,499 pounds gross take off weight) |
| Engine Manufacturer | LYCOMING |
| Engine Model | IO-360-L2A |
| Engine Type | Reciprocating |
| Number of Engines | 1 engine |
| Horsepower | 180 hp (134 kW) |
| Type of Registrant | Government |
| Owner Name | SOUTH DAKOTA STATE UNIVERSITY |
| Street | 201 W 2ND ST S |
| City | BROOKINGS |
| State | SD |
| Zip Code | 57006-1808 |
| Region | Great Lakes |
| County | Brookings County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Standard |
| Airworthiness Date | 2007-02-12 |
| Certificate Issue Date | 2022-11-26 |
| Last Action Date | 2022-11-26 |
| Expiration Date | 2029-11-30 |
| Status | Valid Registration |
| Mode S Code | 50341561 |
| Mode S Code Hex | A1C371 |
Deregistered Aircraft 1 of 2. This aircraft was previously assigned the N-number N2121F.
| Tail Number / N-Number | N2121F |
| Manufacturer | CESSNA |
| Model | 172R |
| Year Built | 2004 |
| Manufacturer's Serial Number | 17281213 |
| Aircraft Type | Fixed wing single engine |
| Category | Land |
| Builder Certification | Type Certificated |
| Number of Seats | 4 seats |
| Weight Class | CLASS 1 (Up to 12,499 pounds gross take off weight) |
| Engine Manufacturer | LYCOMING |
| Engine Model | IO-360-L2A |
| Engine Type | Reciprocating |
| Number of Engines | 1 engine |
| Horsepower | 180 hp (134 kW) |
| Type of Registrant | Corporation |
| Owner Name | AMERICAN AVIATION CONSULTANTS INC |
| Street | 3511 SILVERSIDE RD STE 105 |
| City | WILMINGTON |
| State | DE |
| Zip Code | 19810-4902 |
| County | Brookings County |
| Country | US |
| Airworthiness Classification | Standard |
| Airworthiness Date | 2004-04-12 |
| Certificate Issue Date | 2004-04-16 |
| Last Action Date | 2004-04-16 |
| Last Status | Valid Registration |
| Cancellation Date | 2004-05-27 |
| Exported To | GERMANY |
Deregistered Aircraft 2 of 2. This aircraft was previously assigned the N-number N2121F.
| Tail Number / N-Number | N2121F |
| Manufacturer | CESSNA |
| Model | U206 |
| Manufacturer's Serial Number | U-206-0321 |
| Aircraft Type | Fixed wing single engine |
| Category | Land |
| Builder Certification | Type Certificated |
| Number of Seats | 6 seats |
| Weight Class | CLASS 1 (Up to 12,499 pounds gross take off weight) |
| Number of Engines | 1 engine |
| Average Cruising Speed | 132 miles per hour |
| Type of Registrant | Corporation |
| Owner Name | AIR CENTER SALES INC |
| Street | P O BOX 32129 |
| City | OKLAHOMA CITY |
| State | OK |
| Zip Code | 73132 |
| Region | Southwestern |
| County | Brookings County |
| Certificate Issue Date | 1974-11-26 |
| Last Status | Valid Registration |
| Cancellation Date | 1975-03-11 |
| Exported To | PERU |