SALT LAKE CITY - September 23, 2004: Groen Brothers Aviation, Inc. (OTC:BB GNBA) announced today the first international flight of its SparrowHawk Gyroplane, designed and manufactured by GBAís American Autogyro. Alex Lameko, owner of American Autogyro of Moscow and builder of the kit built SparrowHawk, was pleased and excited with the performance and stability of the aircraft. Test pilot Dmitry Rakitskiy reported a very smooth flight in ideal weather conditions. David Groen, GBA President & CEO said "We are delighted to see the first of what will be many SparrowHawk Gyroplanes in international skies. SparrowHawks are currently under construction by our dealers in Canada and New Zealand." American Autogyro also has authorized international dealers in Costa Rica, Ecuador, Bahamas and South Africa in addition to representatives in Korea and India. American Autogyro is building a solid dealer network here in the U.S. and currently has twenty authorized U.S. dealers.

"Weíve come a long way in the less than two years since American Autogyro began" said Jim Mayfield, President of American Autogyro and Chief Technical Officer of Groen Brothers Aviation. "Weíre not only getting a great reaction from the general aviation community, but high interest from those new to the joy of flying. With kit sales already at more than fifty aircraft, GBA is ramping up production for the SparrowHawk market to provide aircraft for its dealers worldwide." The SparrowHawk, an enclosed, centerline thrust, two-place kit-built gyroplane, is dynamically and statically stable and provides great safety advantages over earlier kit designs. The large two-place cabin with a width of 44 inches, more than 4 inches wider than a Cessna 172, provides great visibility and comfort for the pilot and passenger.

The SparrowHawk is also being offered as a fully assembled aircraft designed specifically for aerial observation. The SparrowHawk APV (Airborne Patrol Vehicle) model offers unequaled low cost aerial observation capabilities to both US and international government agencies.

In addition to its SparrowHawk, American Autogyro designs and produces stability augmentation kits for other manufacturersí kit built gyroplanes. For more information on the performance and safety aspects of the SparrowHawk Gyroplane, visit American Autogyroís website at www.americanautogyro.com.

About Groen Brothers Aviation

Groen Brothers Aviation has developed the first commercially viable modern gyroplane. The gyroplane is a hybrid aircraft with the low operating cost of an airplane and the off-runway operating capability of a helicopter. The Company has a nationwide dealership network and the Hawk 4, upon which the Homeland Defender is based, is in the process of certification with the FAA. Information about Groen Brothers Aviation, its products, and individual members of "GBA Team Hawk" are available on the company's web site at: www.gbagyros.com.

Safe Harbor Statement/Forward-looking Information Disclaimer

Certain statements in this news release are forward-looking within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended. Forward-looking information is subject to risk and uncertainty. Certain statements in this Press Release may contain "forward-looking" information that involves risk and uncertainty, including projections for deliveries, sales, and other trend projections. Actual future results and trends may differ materially depending on a variety of factors, including the Company's successful execution of internal performance plans; product performance; risks associated with regulatory certifications of the Company's commercial aircraft by U.S. and foreign governments; other regulatory uncertainties; collective bargaining labor disputes; performance issues with key suppliers and subcontractors; governmental export and import policies; and the ability to adequately finance operations to the date of FAA certification, manufacturing, and delivery.