Homebuilt aircraft, also known as amateur-built aircraft or kit planes, are constructed by persons for whom this is not a professional activity. These aircraft may be constructed from "scratch", from plans, or from assembly kits.

The Ace Baby Ace, a single-seat, single-engine, parasol wing, fixed-gear light airplane, was marketed as a homebuilt aircraft when its plans were first offered for sale in 1929 — one of the first homebuilt aircraft plans available in the United States. Plans are still available and Baby Aces are still being built. Orland Corben designed a series of aircraft for the Ace Aircraft Manufacturing Company, the Baby Ace, Junior Ace, and Super Ace. Corben's name was associated with the aircraft, and it is commonly known as the Corben Baby Ace.