| Tail Number / N-Number | N1521W |
| Manufacturer | BALLOON WORKS |
| Model | FIREFLY 7 |
| Year Built | 1981 |
| Manufacturer's Serial Number | 11055 |
| Aircraft Type | Balloon |
| 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 | NONE |
| Engine Model | NONE |
| Number of Engines | 0 engines |
| Average Cruising Speed | 63 miles per hour |
| Type of Registrant | Individual |
| Owner Name | MCNABB DONALD I |
| Street | 109 NO OLD ORCHARD |
| City | ST LOUIS |
| State | MO |
| Zip Code | 63119 |
| Region | Central |
| County | St. Louis County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Standard |
| Airworthiness Date | 1981-09-07 |
| Certificate Issue Date | 1981-11-18 |
| Last Action Date | 2021-07-21 |
| Expiration Date | 2028-12-31 |
| Status | Valid Registration |
| Mode S Code | 50152055 |
| Mode S Code Hex | A0D42D |