Aerothermodynamic Phenomena and the Design of Atmospheric Hypersonic Airplanes.- Concepts of Hypersonic Aircraft.- Hypersonic Wind Tunnel Testing.- Wind-Tunnel Based Definition of the AFE Aerothermodynamic Environment.- High-Enthalpy Testing in Hypersonic Shock Tunnels.- Low Density Facilities.- Hypersonic Boundary-Layer Transition.- Some Viscous Interactions Affecting the Design of Hypersonic Intakes and Nozzles.- Permissions.