Seems to me that if LS want to fly to exotic places like Hong Kong - jamaica or Florida Mexico et al - Dart will have to buy a proper a/c for the job such as a 747. No point in having to do multi stops with a 767. Pax will not use Jet2 when they can get a better deal with airlines - with a/c designed for the long haul job.
Just my opinion, but they could if using a 767 fly to destinations such as Kenya, rather than the Far East.