The aircraft will use air conditioners to control the temperature, so that the temperature in the cabin will not be particularly low; and the rocket needs to pass through the same height safely.

The air circulation refrigeration system achieves refrigeration by adiabatic expansion of compressed air in the expander to obtain low-temperature airflow. Its ideal working process includes four processes: isentropic compression, isobaric cooling, isentropic expansion and isobaric heat absorption.