Fastest Subsonic Airliner

Has anybody considered the Boeing 720B which Boeing marketed to hit the CV-990 market….I’ve just flipped through John Stroud’s JETLINERS (in Service from 1952)….full of techie details…. and he was lucky enough to ride on the record-breaking PIA delivery flight of their first 720B London-Beirut-Karachi recording Mach nos 0.86-0.89 averaging 665 mph (they had a 100knot tailwind later on)…if there are no 720Bs still flying maybe Travolta’s 707-138B is a candidate, heavier structure than the 720B but almost identical aerodynamically.
(Stroud also records a London Munich flight in a BEA Trident 1 doing Mach 0.865)