"Three machines fight together as a consort plane. It collaborates in combat with special actions customized to specific players. When a player begins this kind of action, because the other pilots are devoted to their own duties, Goliath will intuit the habits of the other pilots and execute her special actions."
-Sonic Wings Assault Japanese game manual
The "Mother Ship Goliath" serves as an aircraft carrier and mobile command center for the pilots of Assault. Ellen presumably gives her radio commands from the Goliath, and according to the above description from the game manual, the Goliath can execute attacks as well. Two missions involve the Goliath: "Air Docking" in which the player must land her/his craft in one "arm" of the carrier, and "Goliath Defense."