Deregistered Aircraft 1 of 2. This aircraft was previously assigned the N-number N37558.
| Tail Number / N-Number | N37558 |
| Manufacturer | WILLIAMS |
| Model | VARI-VIGGEN |
| Manufacturer's Serial Number | 142 |
| Aircraft Type | Fixed wing single engine |
| Category | Land |
| Builder Certification | Not Type Certificated |
| Number of Seats | 2 seats |
| 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 | Individual |
| Owner Name | WILLIAMS HERMAN R |
| Street | 1850 NORWOOD AVE |
| City | BOULDER |
| State | CO |
| Zip Code | 80302 |
| Region | Northwest Mountain |
| Certificate Issue Date | 1976-04-16 |
| Last Status | Valid Registration |
| Cancellation Date | 1980-10-17 |
| Mode S Code | 51044606 |
| Mode S Code Hex | A44986 |
Deregistered Aircraft 2 of 2. This aircraft was previously assigned the N-number N37558.
| Tail Number / N-Number | N37558 |
| Manufacturer | DOUGLAS |
| Model | DC-6B |
| Manufacturer's Serial Number | 43300 |
| Aircraft Type | Fixed wing multi engine |
| Category | Land |
| Builder Certification | Type Certificated |
| Number of Seats | 96 seats |
| Weight Class | CLASS 3 (20,000+ pounds gross take off weight) |
| Number of Engines | 4 engines |
| Average Cruising Speed | 216 miles per hour |
| Type of Registrant | Corporation |
| Owner Name | UNITED AIR LINES INC |
| Street | 5959 S CICERO AVENUE |
| City | CHICAGO |
| State | IL |
| Zip Code | 60021 |
| Region | Great Lakes |
| Certificate Issue Date | 1952-02-12 |
| Last Status | Valid Registration |
| Cancellation Date | 1968-06-01 |
| Mode S Code | 51044606 |
| Mode S Code Hex | A44986 |