The Dassault Falcon Jet is being used for intercontinental routes, and a new version is supposed to be supersonic.
But I doubt you'll see any commercial aircraft that small (actually, compared to some intercontinental biz-jets, it's quite large!).
In any event, there is a critical mass you need for intercontinental travel. Simply because of the distances involved and the resultant fuel burn, larger numbers of passengers have to be grouped together to make a profit.
About the only way you'll see aircraft under 120 pax is if it's supersonic and doesn't burn as much fuel or cost as much to buy as the Concorde. And even 120 pax may be too small. I don't know what kind of 737-NGs and A320s are being used on the trans-Atlantic routes.
Those who fail to learn history are doomed to repeat it in summer school.