| Tail Number / N-Number | N4SX |
| Manufacturer | SCHERR ALLAN L |
| Model | LANCAIR IV |
| Year Built | 1999 |
| Manufacturer's Serial Number | LIV-116 |
| Aircraft Type | Fixed wing single engine |
| Category | Land |
| Builder Certification | Not Type Certificated |
| Number of Seats | 4 seats |
| Weight Class | CLASS 1 (Up to 12,499 pounds gross take off weight) |
| Engine Manufacturer | AMA/EXPR |
| Engine Model | UNKNOWN ENG |
| Number of Engines | 1 engine |
| Kit Manufacturer | LANCAIR INTL INC |
| Kit Model | LANCAIR IV P |
| Type of Registrant | Individual |
| Owner Name | GALLANT ARTHUR |
| Street | 221 LIBERTY SQUARE RD |
| City | BOXBOROUGH |
| State | MA |
| Zip Code | 01719-1600 |
| Region | New England |
| County | Middlesex County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Experimental |
| Airworthiness Date | 1999-09-20 |
| Certificate Issue Date | 2019-12-19 |
| Last Action Date | 2020-02-11 |
| Expiration Date | 2022-12-31 |
| Status | Third Notice for Registration Renewal |
| Mode S Code | 51124625 |
| Mode S Code Hex | A4A995 |
Deregistered Aircraft 1 of 1. This aircraft was previously assigned the N-number N4SX.
| Tail Number / N-Number | N4SX |
| Manufacturer | LOCKHEED |
| Model | 1329 |
| Manufacturer's Serial Number | 5081 |
| Aircraft Type | Fixed wing multi engine |
| Category | Land |
| Builder Certification | Type Certificated |
| Number of Seats | 8 seats |
| Weight Class | CLASS 3 (20,000+ pounds gross take off weight) |
| Number of Engines | 4 engines |
| Average Cruising Speed | 371 miles per hour |
| County | Middlesex County |
| Last Status | N-Number Assigned – but has not yet been registered |