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The pilot of the Spruce Goose had dozens upon dozens of instruments to control while flying. The co-pilot, on the other hand, had very few, as he was not certified to fly the plane.
The wing of the Spruce was so large that there's a door leading to its interior.
Large Spruce Goose
At the Evergreen Aviation Museum in McMinnville, Ore., Howard Hughes' famous Spruce Goose appears to be markedly bigger than everything else around it.