My friend flew from NCL to Barbados in December to meet with a cruise ship; they we're promised a Dreamliner right up to the day of departure and were given the excuse of a technical issue on the day as the reason for the swap to a 767. Their stop in Manchester was for approx 2 hours, during which time they were kept on the aircraft. They flew a 767 on the return leg too, despite the same Dreamliner promise.