So there's no such thing as an X-43A?

Scott Pitzer

The unpiloted X-43A made an 11-second powered flight, then went through some twists and turns during a six-minute glide before plunging into the Pacific Ocean about 400 miles off the California coast.

"It was fun all the way to Mach 7," said Joel Sitz, project manager at NASA's Dryden Flight Research Center.

Flight engineer Lawrence Huebner said preliminary data indicated the needle-nosed jet reached a maximum speed of slightly over seven times the speed of sound, or about 5,000 mph, after a rocket boosted it to about 3,500 mph.
NASA DOES use dashes (or is that a hyphen?)
(And now there's an easy way to remember which subclass had welded sides-- rivets would have cost them a Mach or two!)
Scott Pitzer

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