A-1 Skyraider: The Plane That Gave Birth to the A-10 Warthog?
The A-1 Skyraider was a relatively simple machine. Designed to satisfy U.S. Navy requirements for a carrier-based, single-seat, long-range dive/torpedo bomber, the A-1 was meant to replace World War II airframes, including the Douglas SBD Dauntless, the Grumman TBF Avenger, and the Curtiss SB2C Helldiver.
Source: nationalinterest.org