| Tail Number / N-Number | N904UA |
| Manufacturer | BENJAMIN D EGGERS |
| Model | CHALLENGER II |
| Year Built | 2006 |
| Manufacturer's Serial Number | CH2-0506-2734 |
| Aircraft Type | Fixed wing single engine |
| Category | Land |
| Builder Certification | Not Type Certificated |
| Number of Seats | 2 seats |
| Weight Class | CLASS 1 (Up to 12,499 pounds gross take off weight) |
| Engine Manufacturer | ROTAX |
| Engine Model | 503 SERIES |
| Engine Type | 2 Cycle |
| Number of Engines | 1 engine |
| Horsepower | 52 hp (39 kW) |
| Kit Manufacturer | QUAD CITY ULTRALIGHT ACFT CORP |
| Kit Model | CHALLENGER II |
| Type of Registrant | Individual |
| Owner Name | EGGERS BENJAMIN D |
| Street | 1269 SWEET HOME RD |
| City | CUMBERLAND FURNACE |
| State | TN |
| Zip Code | 37051-5014 |
| Region | Central |
| County | Dickson County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Experimental |
| Airworthiness Date | 2022-08-23 |
| Certificate Issue Date | 2021-10-25 |
| Last Action Date | 2021-10-25 |
| Expiration Date | 2028-10-31 |
| Status | Valid Registration |
| Mode S Code | 53077713 |
| Mode S Code Hex | AC7FCB |
Deregistered Aircraft 1 of 1. This aircraft was previously assigned the N-number N904UA.
| Tail Number / N-Number | N904UA |
| Manufacturer | BOEING |
| Model | 737-522 |
| Year Built | 1990 |
| Manufacturer's Serial Number | 25004 |
| Aircraft Type | Fixed wing multi engine |
| Category | Land |
| Builder Certification | Type Certificated |
| Number of Seats | 149 seats |
| Weight Class | CLASS 3 (20,000+ pounds gross take off weight) |
| Engine Manufacturer | CFM INTL. |
| Engine Model | CFM56 SERIES |
| Engine Type | Turbo-fan |
| Number of Engines | 2 engines |
| Horsepower per Engine | 2,200 hp (1,641 kW) |
| Total Horsepower | 4,400 hp (3,282 kW) |
| Type of Registrant | Corporation |
| Owner Name | UNITED AIR LINES INC |
| Street | ATTN: TREASURER 77 W WACKER DR |
| City | CHICAGO |
| State | IL |
| Zip Code | 60601-1604 |
| County | Dickson County |
| Country | US |
| Airworthiness Classification | Standard |
| Airworthiness Date | 1990-12-14 |
| Certificate Issue Date | 1993-04-30 |
| Last Action Date | 2011-01-25 |
| Last Status | Valid Registration |
| Cancellation Date | 2013-03-21 |