aircraft at speeds over Mach 6. On 3 October 1967, in California, an X-15 reached Mach 6.7. A key technology for hypersonic flight is the Scramjet. The NASA X-43A flew on scramjet for 10 seconds, and then glided for 10 minutes on its last flight in 2004. The Boeing X-51 Waverider flew on scramjet for 210 seconds in 2013, reaching Mach 5.1 on its fourth flight test.

Space vehicle reentry