Not only is the CV990 the fastest (although the Tu154 info is interesting), but it set speed records which will never be broken, since it flew in the days before (a) the 250 kts below Fl100 rule was introduced and (b) there was no traffic, so crews would fly at breakneck speed direct to the outer marker. Certainly on almost every US domestic route the a/c was ever flown on, the speeds set by the CV990 are untouchable and will remain so forever.