| Tail Number / N-Number | N503X |
| Manufacturer | SIDNEY P ESSEX SR |
| Model | SONEX ONEX |
| Manufacturer's Serial Number | 0167 |
| Aircraft Type | Fixed wing single engine |
| Category | Land |
| Builder Certification | Not Type Certificated |
| Number of Seats | 1 seat |
| Weight Class | CLASS 1 (Up to 12,499 pounds gross take off weight) |
| Number of Engines | 1 engine |
| Kit Manufacturer | SONEX AIRCRAFT LLC |
| Kit Model | ONEX |
| Type of Registrant | Individual |
| Owner Name | ESSEX SIDNEY P SR |
| Street | 2049 E DESERT GREENS DR |
| City | FORT MOHAVE |
| State | AZ |
| Zip Code | 86426-8870 |
| Region | Western-Pacific |
| County | Mohave County |
| Country | US |
| Fractional Ownership | No |
| Certificate Issue Date | 2020-10-05 |
| Last Action Date | 2020-10-05 |
| Expiration Date | 2027-10-31 |
| Status | Valid Registration |
| Mode S Code | 51443442 |
| Mode S Code Hex | A64722 |
Deregistered Aircraft 1 of 1. This aircraft was previously assigned the N-number N503X.
| Tail Number / N-Number | N503X |
| Manufacturer | DIGAETANO JAMES S JR |
| Model | AIR COMMAND 503 |
| Year Built | 1987 |
| Manufacturer's Serial Number | 50300001 |
| Aircraft Type | Fixed wing single engine |
| Category | Land |
| Builder Certification | Not Type Certificated |
| Number of Seats | 1 seat |
| Weight Class | CLASS 1 (Up to 12,499 pounds gross take off weight) |
| Engine Manufacturer | BOMBARDIER |
| Engine Model | ROTAX (ALL) |
| Engine Type | Reciprocating |
| Number of Engines | 1 engine |
| Type of Registrant | Individual |
| Owner Name | DIGAETANO JAMES JR S |
| Street | 5249 CAPRICE COURT |
| City | LAS VEGAS |
| State | NV |
| Zip Code | 89118 |
| County | Mohave County |
| Country | US |
| Airworthiness Classification | Experimental |
| Airworthiness Date | 1987-09-18 |
| Certificate Issue Date | 1986-09-11 |
| Last Action Date | 1991-03-23 |
| Last Status | Registration Expired – Pending Cancellation |
| Cancellation Date | 2013-06-11 |