Comment by rob74

There has already been a narrow-body aircraft that can fly transatlantic routes for quite some time: the Boeing 757. In fact, American operated 177 of them until they were retired early in 2020 due to Covid (according to https://en.wikipedia.org/wiki/American_Airlines_fleet; video of a Dublin-Philadelphia flight: https://www.youtube.com/watch?v=U1OIdiKgqrA), and now intends to use the A321 XLR for the same role.