| Tail Number / N-Number | N3121 |
| Manufacturer | CREED K M JR/GPS AERIAL SVCS |
| Model | COMP AIR 7 |
| Manufacturer's Serial Number | 017273 |
| Aircraft Type | Fixed wing single engine |
| Category | Amphibian |
| Builder Certification | Not Type Certificated |
| Number of Seats | 4 seats |
| 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 |
| Kit Manufacturer | AEROCOMP INC |
| Kit Model | COMP AIR 7 |
| Type of Registrant | Individual |
| Owner Name | RYAN MICHAEL H |
| Street | 2800 COVEY LN |
| City | JEFFERSON CITY |
| State | MO |
| Zip Code | 65109-9277 |
| Region | Central |
| County | Cole County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Experimental |
| Airworthiness Date | 2002-04-25 |
| Certificate Issue Date | 2018-01-24 |
| Last Action Date | 2020-08-29 |
| Expiration Date | 2028-01-31 |
| Status | Valid Registration |
| Mode S Code | 50650272 |
| Mode S Code Hex | A350BA |
Deregistered Aircraft 1 of 2. This aircraft was previously assigned the N-number N3121.
| Tail Number / N-Number | N3121 |
| Manufacturer | SHADDOX |
| Model | BENSEN GYROCOPTER B- |
| Year Built | 1971 |
| Manufacturer's Serial Number | 1 |
| Aircraft Type | Rotorcraft |
| 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 |
| Average Cruising Speed | 45 miles per hour |
| Type of Registrant | Individual |
| Owner Name | SHADDOX JOE T |
| Street | PO BOX 1352 |
| City | HARRISON |
| State | AR |
| Zip Code | 72601 |
| Region | Southwestern |
| County | Cole County |
| Country | US |
| Certificate Issue Date | 1972-05-12 |
| Last Status | Valid Registration |
| Cancellation Date | 1977-08-18 |
Deregistered Aircraft 2 of 2. This aircraft was previously assigned the N-number N3121.
| Tail Number / N-Number | N3121 |
| Manufacturer | BENSEN |
| Model | B-8M |
| Manufacturer's Serial Number | RX7464 |
| Aircraft Type | Gyroplane |
| 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 |
| Average Cruising Speed | 45 miles per hour |
| Type of Registrant | Individual |
| Owner Name | LOCKARD CHRISTOPHER |
| Street | 1112 LAFAYETTE APT 4 |
| City | AURORA |
| State | IL |
| Zip Code | 60021 |
| Region | Great Lakes |
| County | Cole County |
| Certificate Issue Date | 1968-10-07 |
| Last Status | Valid Registration |
| Cancellation Date | 1971-08-31 |