| Tail Number / N-Number | N521PM |
| Manufacturer | PIPER |
| Model | PA-31T |
| Year Built | 1977 |
| Manufacturer's Serial Number | 31T-7720048 |
| 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 | P&W CANADA |
| Engine Model | PT6A-60A |
| Engine Type | Turbo-prop |
| Number of Engines | 2 engines |
| Horsepower per Engine | 1,050 hp (783 kW) |
| Total Horsepower | 2,100 hp (1,567 kW) |
| Average Cruising Speed | 162 miles per hour |
| Type of Registrant | LLC |
| Owner Name | AIR FIRST LLC |
| Street | PO BOX 10247 |
| City | KALISPELL |
| State | MT |
| Zip Code | 59904-3247 |
| Region | Northwest Mountain |
| County | Flathead County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Standard |
| Airworthiness Date | 1977-06-27 |
| Certificate Issue Date | 2022-08-22 |
| Last Action Date | 2022-08-22 |
| Expiration Date | 2029-08-31 |
| Status | Valid Registration |
| Mode S Code | 51506766 |
| Mode S Code Hex | A68DF6 |