| Tail Number / N-Number | N644EM |
| Manufacturer | MITSUBISHI |
| Model | MU-2B-60 |
| Year Built | 1980 |
| Manufacturer's Serial Number | 758SA |
| Aircraft Type | Fixed wing multi 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 | AIRESEARCH |
| Engine Model | TPE331 SERIES |
| Engine Type | Turbo-prop |
| Number of Engines | 2 engines |
| Horsepower per Engine | 904 hp (674 kW) |
| Total Horsepower | 1,808 hp (1,349 kW) |
| Type of Registrant | Corporation |
| Owner Name | AIR 1ST AVIATION COMPANIES OF OKLAHOMA INC |
| Street | 3322 N 74TH EAST AVE |
| City | TULSA |
| State | OK |
| Zip Code | 74115-2203 |
| Region | Southwestern |
| County | Tulsa County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Standard |
| Airworthiness Date | 1980-04-23 |
| Certificate Issue Date | 2022-10-13 |
| Last Action Date | 2022-10-13 |
| Expiration Date | 2029-10-31 |
| Status | Valid Registration |
| Mode S Code | 52072207 |
| Mode S Code Hex | A87487 |
Deregistered Aircraft 1 of 1. This aircraft was previously assigned the N-number N644EM.
| Tail Number / N-Number | N644EM |
| Manufacturer | MITSUBISHI |
| Model | MU-2B-60 |
| Manufacturer's Serial Number | 1534 S.A. |
| Aircraft Type | Fixed wing multi 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) |
| Number of Engines | 2 engines |
| Type of Registrant | Individual |
| Owner Name | MARTIN EARLE P |
| Street | 4107 RICE BLVD |
| City | HOUSTON |
| State | TX |
| Zip Code | 77005-2743 |
| County | Tulsa County |
| Country | US |
| Certificate Issue Date | 1997-11-19 |
| Last Action Date | 2010-04-20 |
| Last Status | The Triennial Aircraft Registration form was mailed and has not been returned by the Post Office |
| Cancellation Date | 2010-04-27 |