About 2 years ago, the short-lived "Swiss World Airways" intended to add narrowbody routes to it's transatlantic flights with the 767-200 ex Geneva.
From the November 1998 IATA schedule conference i still have their draft timetable for the summer 1999 season (well, they actually ceased operations I think in December 1998.....). This timetable also included nonstop 737-700 IGW flights between Basle and Newark as well as - if I remember right - Geneva-Washington and Geneva-Montreal.
BTW, what's so wrong with a narrowbody transatlantic flight?? Do you think you have more room on a widebody? Hmm... I wouldn't bet on that..... take a 6-10h flight in seat 75F in a 747, seeing only hundreds of heads in front of you and you will yearn for a window or aisle seat in a 757 or 737....at least I would do...
My favorite place on board a widebody is either the space next to the galley or the upper deck, where you dont have this mass transport or cinema-like feeling...
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Photo © Stefan Gruenig