| Tail Number / N-Number | N251AK |
| Manufacturer | BOEING |
| Model | 737-990ER |
| Manufacturer's Serial Number | 62470 |
| Aircraft Type | Fixed wing multi engine |
| Category | Land |
| Builder Certification | Type Certificated |
| Number of Seats | 222 seats |
| Weight Class | CLASS 3 (20,000+ pounds gross take off weight) |
| Number of Engines | 2 engines |
| Type of Registrant | Corporation |
| Owner Name | ALASKA AIRLINES INC |
| Street | C/O LEGAL DEPART - SEAZL 19300 INTERNATIONAL BLVD |
| City | SEATAC |
| State | WA |
| Zip Code | 98188-5304 |
| Region | Northwest Mountain |
| County | King County |
| Country | US |
| Fractional Ownership | No |
| Certificate Issue Date | 2016-07-14 |
| Last Action Date | 2022-02-14 |
| Expiration Date | 2029-07-31 |
| Status | Valid Registration |
| Mode S Code | 50455477 |
| Mode S Code Hex | A25B3F |