Was the sr-17 Blackbird the fastest airplane ever built?

The X-43 reached Mach 9.8 but it was an unmanned flight.

The X-15 reached Mach 6.72, but it is a rocket powered aircraft.

The Lockheed SR-71 Blackbird, which made it's first flight on December 22, 1964, is still considered to be the world's fastest airplane reaching Mach 3.2 or 2,193.167 MPH in July 1976.

The Lockheed SR-71 Blackbird holds many speed records including flying from New York to London, covering 3,461.53 miles in 1 hour 54 minutes and 56.4 seconds, averaging 1,806.95 MPH.