[Answer] In 1967, what rocket plane became the fastest manned aircraft ever flown?

Step 1 : Introduction to the question "In 1967, what rocket plane became the fastest manned aircraft ever flown?"

...In October 1967, Major William J. Knight took to the skies in the experimental X-15 research aircraft and flew faster than any airplane pilot had flown before — or has flown since. The rocket-powered vehicle reached a top speed of 4,520 miles per hour, more than six times the speed of sound. The X-15 was retired shortly after, and no manned aircraft has approached such speeds again.

Step 2 : Answer to the question "In 1967, what rocket plane became the fastest manned aircraft ever flown?"

X-15:

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