| Tail Number / N-Number | N12157 |
| Manufacturer | EMBRAER |
| Model | EMB-145XR |
| Year Built | 2004 |
| Manufacturer's Serial Number | 145787 |
| Aircraft Type | Fixed wing multi engine |
| Category | Land |
| Builder Certification | Type Certificated |
| Number of Seats | 55 seats |
| Weight Class | CLASS 2 (12,500 - 19,999 pounds gross take off weight) |
| Engine Manufacturer | ROLLS-ROYC |
| Engine Model | AE3007 SER |
| Engine Type | Turbo-fan |
| Number of Engines | 2 engines |
| Thrust per Engine | 6,442 pounds-force (28.7 kN) |
| Total Thrust | 12,884 pounds-force (57.3 kN) |
| Type of Registrant | Corporation |
| Owner Name | UNITED AIRLINES INC |
| Street | 233 S WACKER DR |
| City | CHICAGO |
| State | IL |
| Zip Code | 60606-7147 |
| Region | Great Lakes |
| County | Cook County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Standard |
| Airworthiness Date | 2004-02-21 |
| Certificate Issue Date | 2019-05-31 |
| Last Action Date | 2022-02-23 |
| Expiration Date | 2029-05-31 |
| Status | Valid Registration |
| Mode S Code | 50055220 |
| Mode S Code Hex | A05A90 |