Benleigh,
Boeing 757-200's are used on trans-atlantic flights on a daily basis. For example, American Airlines operate two per day from Chicago and New York in to Manchester, and Continental (United) Airlines two from Newark in to Manchester. Thomas Cook also operate them to Toronto in the summer in a 187 seat configuration. They were designed for trans-continental flights in America with hot and high capabilities to succeed the 727 and once ETOPS rated, have no problem carrying out long haul flights. Iron Maiden, Captained by lead singer Bruce Dickinson are using an Astraeus 752 on tour at the moment on a round the world trip! Before the Boeing 767's joined the fleet, Britannia (that became Thomsonfly / Thomson Airways) used them regularly to Orlando and the Caribbean with a technical stop in Bangor. They have a range of 4,500 miles in a low density configuration. With the heavier weights in the higher density configuration, the range is limited, hence the technical stop enroute but they are more than capable of operating the flights.
Darren