Deregistered Aircraft 1 of 2. This aircraft was previously assigned the N-number N9551A.
| Tail Number / N-Number | N9551A |
| Manufacturer | HELIO |
| Model | HST-550A |
| Year Built | 1969 |
| Manufacturer's Serial Number | 2 |
| Aircraft Type | Fixed wing single 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) |
| Engine Manufacturer | P&W CANADA |
| Engine Model | PT6A-60A |
| Engine Type | Turbo-prop |
| Number of Engines | 1 engine |
| Horsepower | 1,050 hp (783 kW) |
| Average Cruising Speed | 150 miles per hour |
| Type of Registrant | Corporation |
| Owner Name | HELIO AIRCRAFT CORP |
| Street | HANSCOM FIELD CIVILIAN TERMINAL AREA |
| City | BEDFORD |
| State | MA |
| Zip Code | 01730 |
| Country | US |
| Airworthiness Classification | Experimental |
| Airworthiness Date | 1971-09-19 |
| Certificate Issue Date | 1969-09-11 |
| Last Action Date | 2008-06-09 |
| Last Status | Registration Expired – Pending Cancellation |
| Cancellation Date | 2013-05-23 |
| Mode S Code | 53244666 |
| Mode S Code Hex | AD49B6 |
Deregistered Aircraft 2 of 2. This aircraft was previously assigned the N-number N9551A.
| Tail Number / N-Number | N9551A |
| Manufacturer | CESSNA |
| Model | 170A |
| Manufacturer's Serial Number | 19112 |
| 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) |
| Number of Engines | 1 engine |
| Average Cruising Speed | 105 miles per hour |
| Type of Registrant | Corporation |
| Owner Name | CESSNA AIRCRAFT CO |
| Street | XXXXX |
| City | WICHITA |
| State | KS |
| Zip Code | 67202 |
| Region | Central |
| Last Status | Valid Registration |
| Cancellation Date | 1951-10-04 |
| Exported To | ARGENTINA |
| Mode S Code | 53244666 |
| Mode S Code Hex | AD49B6 |