Calypso is Boeing Starliner crew module Spacecraft 3. It flew the uncrewed OFT-1 mission from December 20 to 22, 2019, then was reused for the Crew Flight Test from June 5 to September 7, 2024, becoming the first Starliner capsule to carry astronauts to orbit. It returned autonomously without its crew after propulsion-system problems extended the mission and remains assigned within Boeing's reusable flight fleet.