| Tail Number / N-Number | N491AS |
| Manufacturer | BOEING |
| Model | 737-990ER |
| Year Built | 2015 |
| Manufacturer's Serial Number | 44109 |
| 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) |
| Engine Manufacturer | CFM INTL |
| Engine Model | CFM56-7B27E |
| Engine Type | Turbo-fan |
| Number of Engines | 2 engines |
| Thrust per Engine | 27,300 pounds-force (121.4 kN) |
| Total Thrust | 54,600 pounds-force (242.9 kN) |
| Type of Registrant | Corporation |
| Owner Name | ALASKA AIRLINES INC |
| Street | C/O LEGAL DEPARTMENT - SEAZL 19300 INTERNATIONAL BLVD |
| City | SEATTLE |
| State | WA |
| Zip Code | 98188 |
| Region | Northwest Mountain |
| County | King County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Standard |
| Airworthiness Date | 2015-11-25 |
| Certificate Issue Date | 2015-12-03 |
| Last Action Date | 2021-07-13 |
| Expiration Date | 2028-12-31 |
| Status | Valid Registration |
| Mode S Code | 51411740 |
| Mode S Code Hex | A613E0 |