In 1939, Seversky was removed as head of his company and the Republic Aviation Company was born. The first major aircraft to emerge from the new company was the P-47, using a new innovative design of Kartveli. Two concept works named XP-44 and XP-47 were developed but dropped as they did not meet the requirements of the Air Corps. According to records, Kartveli was called in from the Experimental Aircraft Division of the USAAC and informed about the prototypes being cancelled. During his return to New York on a train, he took a sheet of paper and drew a completely new design. The new aircraft was intended to break the back of the German Luftwaffe. The famous P-47 Thunderbolt with its robust characteristics was born. More than 15,000 P-47s would be constructed. Despite some flaws, the heavily armed and extremely sturdy aircraft achieved more than Kartveli could hope.