[1] The name came from Jules Gastambide, who financed the company, and Gabriel Mengin, the aircraft engineer.

[2] The monoplane (later known as the Gastambide-Mengin I) was powered by a 50 hp (37 kW) Antoinette piston engine driving a tractor propeller.

[1] The monoplane made four flights between 8 and 14 February 1908 flown by a mechanic named Boyer, the furthest being a flight of 150 m.[1] After these flights, the aircraft was rebuilt between February and August 1908 as the Gastambide-Mengin II (later named the Antoinette II), the modifications including revised, trailing edge-hinged triangular ailerons.

[1] The modified aircraft made three short flights in August 1908, one of these on 21 August 1908 being the first circle flown by a monoplane, and on a flight the previous day (20 August 1908) Robert Gastambide became the first passenger flown in a monoplane.

[1] With lessons learnt from the design, Levavasseur went on to design a family of monoplanes named after Antoinette Gastambide, the daughter of Jules Gastambide.