| Tail Number / N-Number | N661NK |
| Manufacturer | AIRBUS |
| Model | A321-231 |
| Year Built | 2015 |
| Manufacturer's Serial Number | 6867 |
| Aircraft Type | Fixed wing multi engine |
| Category | Land |
| Builder Certification | Type Certificated |
| Number of Seats | 379 seats |
| Weight Class | CLASS 3 (20,000+ pounds gross take off weight) |
| Engine Manufacturer | IAE |
| Engine Model | V2533-A5 |
| Engine Type | Turbo-fan |
| Number of Engines | 2 engines |
| Thrust per Engine | 31,600 pounds-force (140.6 kN) |
| Total Thrust | 63,200 pounds-force (281.1 kN) |
| Type of Registrant | Corporation |
| Owner Name | SPIRIT AIRLINES INC |
| Street | 2800 EXECUTIVE WAY |
| City | MIRAMAR |
| State | FL |
| Zip Code | 33025-6542 |
| Region | Southern |
| County | Broward County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Standard |
| Airworthiness Date | 2015-12-01 |
| Certificate Issue Date | 2015-11-30 |
| Last Action Date | 2021-10-13 |
| Expiration Date | 2028-11-30 |
| Status | Valid Registration |
| Mode S Code | 52134446 |
| Mode S Code Hex | A8B926 |