The fastest subsonic airliner was the CV990!!! It was called by Cap. Rudolfo "Rudy" Bay from Spantax, a huge CV990 operator, "The Maserati of the Skies"!!!
That bird could fly the maximum speed of 990 Kph at 22.000 ft. I think the next one was the Boeing 720 that could fly at 972 Kph.