| Tail Number / N-Number | N57EF |
| Manufacturer | BELL |
| Model | 206B |
| Year Built | 1971 |
| Manufacturer's Serial Number | 660 |
| Aircraft Type | Rotorcraft |
| Category | Land |
| Builder Certification | Type Certificated |
| Number of Seats | 5 seats |
| Weight Class | CLASS 1 (Up to 12,499 pounds gross take off weight) |
| Engine Manufacturer | ALLISON |
| Engine Model | 250-C20B |
| Engine Type | Turbo-shaft |
| Number of Engines | 1 engine |
| Horsepower | 420 hp (313 kW) |
| Average Cruising Speed | 112 miles per hour |
| Type of Registrant | LLC |
| Owner Name | CK HELICOPTERS LLC |
| Street | 1240 W 400N |
| City | JASPER |
| State | IN |
| Zip Code | 47546-8655 |
| Region | Great Lakes |
| County | Dubois County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Standard |
| Airworthiness Date | 2011-03-31 |
| Certificate Issue Date | 2021-01-21 |
| Last Action Date | 2021-01-21 |
| Expiration Date | 2028-01-31 |
| Status | Valid Registration |
| Mode S Code | 51646172 |
| Mode S Code Hex | A74C7A |
Deregistered Aircraft 1 of 1. This aircraft was previously assigned the N-number N57EF.
| Tail Number / N-Number | N57EF |
| Manufacturer | PIPER |
| Model | PA-31P |
| Year Built | 1974 |
| Manufacturer's Serial Number | 31P-7400215 |
| 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) |
| Engine Manufacturer | LYCOMING |
| Engine Model | TIGO-541SER |
| Engine Type | Reciprocating |
| Number of Engines | 2 engines |
| Horsepower per Engine | 400 hp (298 kW) |
| Total Horsepower | 800 hp (597 kW) |
| Average Cruising Speed | 162 miles per hour |
| Type of Registrant | Corporation |
| Owner Name | CEO AIR INC |
| Street | 225 ALLENS CREEK RD |
| City | ROCHESTER |
| State | NY |
| Zip Code | 14618-4135 |
| County | Dubois County |
| Country | US |
| Airworthiness Classification | Standard |
| Airworthiness Date | 1974-06-07 |
| Certificate Issue Date | 2002-01-09 |
| Last Action Date | 2005-01-18 |
| Last Status | The Triennial Aircraft Registration form was mailed and has not been returned by the Post Office |
| Cancellation Date | 2005-02-23 |