The Wooden Airplane, as the name states, is an airplane made entirely of wood.
Role in episode
After the failing of the Flight Trainer, Sandy creates the Wooden Airplane for SpongeBob to test out flying. After tying a rope to the bottom of it, Sandy sends SpongeBob into the air where he flies the Wooden Airplane for a short time. The rope ends up wrapping around the pole causing the Wooden Airplane to get tangled. Despite this, Sandy believes SpongeBob is ready to fly a real airplane.