| Tail Number / N-Number | N20RM |
| Manufacturer | CESSNA |
| Model | 501 |
| Manufacturer's Serial Number | 501-0025 |
| 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 |
| Type of Registrant | LLC |
| Owner Name | SDI AVIAITON LLC |
| Street | 3250 S FOX RANCH RD |
| City | RHINELANDER |
| State | WI |
| Zip Code | 54501-9177 |
| Region | Great Lakes |
| County | Oneida County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Standard |
| Airworthiness Date | 1977-11-16 |
| Certificate Issue Date | 2008-06-25 |
| Last Action Date | 2020-08-12 |
| Expiration Date | 2027-10-31 |
| Status | Valid Registration |
| Mode S Code | 50310455 |
| Mode S Code Hex | A1912D |
Deregistered Aircraft 1 of 2. This aircraft was previously assigned the N-number N20RM.
| Tail Number / N-Number | N20RM |
| Manufacturer | MABREY-MARTIN |
| Model | VOLKSPLANE VP-1 |
| Manufacturer's Serial Number | V-300-RM |
| 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 |
| Average Cruising Speed | 85 miles per hour |
| Type of Registrant | Partnership |
| Owner Name | MABREY RUSSELL B |
| Street | 71969 TRAILWOOD RD |
| City | PLYMOUTH |
| State | MI |
| Zip Code | 48170 |
| Region | Great Lakes |
| County | Oneida County |
| Certificate Issue Date | 1971-04-01 |
| Last Status | Valid Registration |
| Cancellation Date | 1973-12-19 |
Deregistered Aircraft 2 of 2. This aircraft was previously assigned the N-number N20RM.
| Tail Number / N-Number | N20RM |
| Manufacturer | CESSNA |
| Model | T210M |
| Manufacturer's Serial Number | 21062396 |
| 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 | 141 miles per hour |
| County | Oneida County |
| Last Status | N-Number Assigned – but has not yet been registered |
| Cancellation Date | 1988-08-18 |