| Tail Number / N-Number | N4123 |
| Manufacturer | MOONEY |
| Model | M-18C |
| Manufacturer's Serial Number | 291 |
| Aircraft Type | Fixed wing single engine |
| Category | Land |
| Builder Certification | Type Certificated |
| Number of Seats | 1 seat |
| Weight Class | CLASS 1 (Up to 12,499 pounds gross take off weight) |
| Engine Manufacturer | CONT MOTOR |
| Engine Model | A&C65 SERIES |
| Engine Type | Reciprocating |
| Number of Engines | 1 engine |
| Horsepower | 65 hp (48 kW) |
| Average Cruising Speed | 103 miles per hour |
| Type of Registrant | Individual |
| Owner Name | KING ERNEST W III |
| Street | 901 MAPLE ST |
| City | UVALDE |
| State | TX |
| Zip Code | 78801-5407 |
| Region | Southwestern |
| County | Uvalde County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Standard |
| Airworthiness Date | 1956-05-28 |
| Certificate Issue Date | 2013-03-01 |
| Last Action Date | 2021-10-12 |
| Expiration Date | 2029-03-31 |
| Status | Valid Registration |
| Mode S Code | 51157117 |
| Mode S Code Hex | A4DE4F |
Deregistered Aircraft 1 of 1. This aircraft was previously assigned the N-number N4123.
| Tail Number / N-Number | N4123 |
| Manufacturer | WACO |
| Model | GXE |
| Manufacturer's Serial Number | 1282 |
| Aircraft Type | Fixed wing single engine |
| Category | Land |
| Builder Certification | Type Certificated |
| Number of Seats | 3 seats |
| Weight Class | CLASS 1 (Up to 12,499 pounds gross take off weight) |
| Number of Engines | 1 engine |
| Average Cruising Speed | 119 miles per hour |
| Type of Registrant | Co-Ownership |
| Owner Name | KRALL MARK B & FRANKLIN R LAW |
| Street | ROUTE 2 |
| City | MYERSTOWN |
| State | PA |
| Zip Code | 19102 |
| Region | Eastern |
| County | Uvalde County |
| Last Status | Valid Registration |
| Cancellation Date | 1937-05-17 |