rootbrowseIAC-21D2session 66. Future Space Transportation Systems Verification and In-Flight ExperimentationPapers1. Towards a Reusable First Stage Demonstrator: CALLISTO – Technical Progresses & Challenges2. The Reusability Flight Experiment – ReFEx: From Design to Flight – Hardware3. Sounding Rocket Research Infrastructure Developments4. Main Achievements of the Sounding Rocket Flight Experiment ATEK5. STORT Flight Experiment for High Speed Technology Demonstration8. Flight experiment for a High-Temperature Superconducting coil9. In-flight and ground tests of an inexpensive suborbital PERUN rocket and its green hybrid rocket engine in preparation for the first full scale flight in 2022.1006. Space Rider: a reusable re-entry system for multiservicing experimentation payloads1007. Space Rider: Thermal Protection System and Hot Structures design and development status.1010. Study on the Effectiveness Evaluation of the Atmospheric Hyper-speed Vehicles