NW stated in their release as to why they chose the A330 as their transatlantic ship that, should they choose a 300-350seater, PW
engines would not be a limiting factor.
-powered 772s are looked upon unfavorably; and PW
engines are not, nor will they ever be, an optin on the 777NGs.
Something of an advantage to Airbus is that they could theoretically offer the A340NGs with PW
engines, should sufficient demand be proven.