| Tail Number / N-Number | N423J |
| Manufacturer | BRADLEY W MCNAMARA |
| Model | GLASAIR SPER II-RG |
| Manufacturer's Serial Number | 2471 |
| 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) |
| Number of Engines | 1 engine |
| Kit Manufacturer | GLASAIR AVIATION LLC |
| Kit Model | SUPER II-RG |
| Type of Registrant | Corporation |
| Owner Name | ALTERNATE AIR INC |
| Street | 7170 PERIMETER RD S STE A |
| City | SEATTLE |
| State | WA |
| Zip Code | 98108-3809 |
| Region | Northwest Mountain |
| County | King County |
| Country | US |
| Fractional Ownership | No |
| Certificate Issue Date | 2016-01-12 |
| Last Action Date | 2021-11-12 |
| Expiration Date | 2029-01-31 |
| Status | Valid Registration |
| Mode S Code | 51203614 |
| Mode S Code Hex | A5078C |