Which aircraft is known as the "Spruce Goose"?

The Hughes H-4 Hercules, commonly referred to as the "Spruce Goose," is an iconic aircraft famously known for being the largest flying boat ever constructed. It was designed and built by Howard Hughes during and after World War II. The name "Spruce Goose" comes from the materials used in its construction; although it was primarily built from a type of plywood made from birch, the name has stuck as a nickname largely due to its size and the perception that it was made from spruce.

The Hughes H-4 Hercules made its maiden flight on November 2, 1947, and despite its short operational history, it remains a symbol of innovation in aviation. The aircraft was built to transport troops and war supplies across the oceans, demonstrating significant advancements in aircraft technology at the time.

In contrast, the other options—Lockheed Constellation, Boeing 747, and Douglas DC-3—while significant in their own right, do not hold the same unique title or nickname as the "Spruce Goose." Each of these aircraft has its own historical context and accomplishments, but they lack the specific connection to Howard Hughes and the remarkable story of the H-4 Hercules.