The proposed Cryoflight cryocooler development effort will support NASA's long-term goal to increase aircraft efficiency and reduce aircraft emissions and noise. By providing a cryocooler optimized to meet the aggressive power density target required for aircraft systems, we will remove a key obstacle hindering the development of superconducting aircraft. While such aircraft are still two or three decades from production, supporting technology development needs to begin now if such aircraft are to become a viable alternative to the aircraft configurations in production today. The results of this SBIR project will support NASA design trade studies, system demonstrations, and eventual superconducting aircraft demonstrations. Other NASA applications include space applications such as cryogen liquefaction and storage for planetary and extraterrestrial exploration missions, CEVs, extended-life orbital transfer vehicles, in-space propellant depots, and extraterrestrial bases. Terrestrial NASA applications include cooling for spaceport cryogen storage and transportation systems, and demonstrations of hydrogen production and transportation systems. The highly reliable and space-proven turbo-Brayton cryocooler is ideal for these applications. High-temperature superconducting (HTS) materials have the potential to revolutionize the way we generate, transmit, and consume power. Transformational initiatives that rely on HTS technologies include power conditioning and power transmission systems, large-scale offshore wind turbines, high efficiency data centers, Navy ship systems, and turboelectric aircraft. While the latter is the target application for the proposed cryocooler, the other applications represent potential near-term markets for the technology. There is also a large potential market beyond HTS applications, including cooling for laboratory and industrial-scale gas separation, liquefaction, cryogen storage and cryogen transportation systems, liquid hydrogen fuel cell storage for the automotive industry, and commercial orbital transfer vehicles and satellites.