Having served with an artillery unit, Georges Flachaire transferred to aviation in 1915. He scored eight victories flying Nieuport scouts with Escadrille 67. In 1918, he was posted to the United States to assist with the development of aviation plans by the Allies.
The Philadelphia Inquirer, Philadelphia, Pennsylvania, Friday Morning, 29 Mar 1918, page 8
"On 30 April 1916, he attacked an enemy plane that was bombing our positions. After a serious combat during which he ran out of ammunition and fuel, he manoeuvred so adroitly that he forced his adversary to land in our lines where the pilot and observer were made prisoners. Already cited in Orders." Médaille Militaire citation, 10 May 1916
"Remarkable pilot of skill, courage and audacity, which he displayed during recent operations, during the course of which he provided the most highly conspicuous services. On 20 and 21 October 1916, he downed, in the most brilliant fashion, his fourth and fifth enemy planes. The first in our lines and the second in the German Lines. Médaille Militaire and cited in orders three times." Légion d'Honneur citation, 18 November 1916