Swiss Air Lines is now a full member of the Star Alliance. It has added a second daily nonstop from JFK to ZRH. Continental does well on its daily EWR to ZRH routes, occasionally subbing a 767-400 for the 767-200. American and Swiss no longer code share. AA does have a significant share of the New York area business travel market, but I just don't see this route surviving beyond the summer. It was first introduced in 1987 and axed in the late 1990's only to return when LX and AA started code sharing in 2004.
I think AA will keep the DFW-ZRH route for now, especially if LX were to pull out of LAX-ZRH, which has been rumored, but then again SR and LX have flown that route since 1989.
I would think the majority of the traffic to ZRH originates east of the Mississippi.
Surely the AA 767 used on the JFK-ZRH route would be better utilized elsewhere.