All due to post-Brexit complexities - SE-RFZ uses Nordic-based pilots on and a relatively small pool of UK-based cabin crew who have dispensation to fly under the Swedish AOC. So the flight deck & cabin crew are not 100% interchangeable with the G-Reg 787 fleet. Therefore the most efficient way of using the aircraft is to use on the Cancun route which operates up to 6 x weekly - means the crew are only stopping in Cancun one night and there is one pool of crew allocated to this specific route which eliminates a lot of complexity. This year the route runs 6 x times weekly rather than daily, no flight on Tuesday to provide ‘catch up time’, maintenance input & deep cleaning.