Staging copy. The live site is at https://staging.data.eflight.com.
eFlight RegistryFAA data, updated daily
Registered aircraft · FAA record as of September 25, 2026
N4042D

Balloon Works FIREFLY 7

Valid Colorado

N4042D is a Balloon Works FIREFLY 7, a balloon with no engine, built in 1978. It has 1 seat. It is registered to Mile High Aeronauts INC, a corporation in Littleton, Colorado. The registration is valid: it was issued on February 12, 1979 and expires on July 31, 2029. It holds a standard airworthiness certificate.

Aircraft

Maker
Balloon Works
Model
FIREFLY 7
Serial number
7855
Type
Balloon
Power
None · None NONE
Seats
1
Year built
1978
Cruising speed
63 mph
Transponder code
A4BE1F (octal 51137037)

Registration

Status
Valid registration
Certificate issued
February 12, 1979
Expires
July 31, 2029
Last FAA action
August 18, 2023
Airworthiness
Standard
FAA region
Northwest Mountain
FAA record id
00641104

Owner as the FAA publishes it

Name
Mile High Aeronauts INC
Type
Corporation
Address
PO Box 3388
Littleton, CO 80161

Owners can ask the FAA to withhold their name and address from public files. When they do, those fields are blank here as well. How that works.

Documents on file 0

No bills of sale, loans or other documents are indexed against this tail number.

Earlier use of this number 1

1957-11-18Cessna 182A · Valid registration

Source: FAA Civil Aviation Registry, Releasable Aircraft Database, September 25, 2026. See this record on the FAA site · This record as data