The Laté 299-01 prototype served as a test bench for Hispano-Suiza 12Z engines coupled according to a process developed by the engineer.general Vernisse at the Arsenal. Became Laté 299A, twin-engine tandem with coaxial propellers, its transformation was completed in 1942 at Toulouse. It was captured and painted in German colors. It wore black crosses, but no code. It was under these colors that it made its first fixed gear tests on July 22, 1943. But during taxi tests on August 23, 1943 by Pierre Crespy, it fell on his nose  at Blagnac. It was then transferred by road in early 1944, from the Latécoère factory in Toulouse to that of the Arsenal in Villeurbanne, in the Lyon suburbs. After a return trip with mechanic Lucien Boy in early March to Montpellier for repair, the plane returned to Lyon. Contrary to what was generally written on this aircraft, several flights were made in Bron by Modeste Vonner, accompanied by engineer Guy Malepot: a flight on April 25, then t 35 min on the 27th, and 40 min the next day. It was burned on April 30, 1944 during a bombardment.

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