| Tail Number / N-Number | N621XT |
| Manufacturer | HAMMERSMITH KIRK |
| Model | LANCAIR ES |
| Year Built | 2004 |
| Manufacturer's Serial Number | ES-191 |
| 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 | CONT MOTOR |
| Engine Model | TSIO-550 SER |
| Engine Type | Reciprocating |
| Number of Engines | 1 engine |
| Horsepower | 280 hp (209 kW) |
| Kit Manufacturer | LANCAIR INTL INC |
| Kit Model | LANCAIR ES/ES FAST |
| Type of Registrant | LLC |
| Owner Name | HUFF AIR LLC |
| Street | 1 SKY WAY |
| City | UVALDE |
| State | TX |
| Zip Code | 78801 |
| Region | Southwestern |
| County | Uvalde County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Experimental |
| Airworthiness Date | 2004-11-30 |
| Certificate Issue Date | 2018-07-09 |
| Last Action Date | 2021-02-23 |
| Expiration Date | 2028-07-31 |
| Status | Valid Registration |
| Mode S Code | 52016023 |
| Mode S Code Hex | A81C13 |