You obviously don't know your engines since you cried earlier about Continental flying 757's over to Europe.
CO's 757's use the Rolls Royce engines, and can fly for over 9hours. I guess you won't fly from sfo-ewr on 757's either. A Newark-Birmingham England flight is 6hours 20min, and a Newark-San francisco flight is 6 hours 10 min. So what is the difference?
Open your heart and push the limits