The CT/264 system-of-systems is a next generation screening solution for the aviation security checkpoint, combining HALO X-ray diffraction (XRD) threat resolving capability with industry standard CT X-ray transmission data in a fully automated tray return system. This combined system offers a cost-effective solution with the lowest false alarm rate. It utilises one of the most advanced X-ray diffraction technologies combined with CT checkpoint screening systems. It has an optimised footprint, high reliability and operates at the speed of a typical screening lane.