We were informed by TUI that we would be flying on an Olympus aircraft from Manchester to Dalaman on 27 May returning 3 Jun. Ended up on a delayed Sunwings aircraft from Dublin on 27th and returned on a B787-9 with originally 150+ empty seats. Sat on the aircraft for nearly 2 hours whilst we took on the pax from a Sunwings 737 to Norwich that had crew issues. The Sunwings aircraft went back to Norwich empty I believe whilst the not so happy Norwich pax came to Manchester prior to a long coach journey home back to Norwich. They were obviously not too pleased but credit to the Captain and crew of TOM715 who did a great job dealing with a difficult situation and the decisions obviously made by TUI Ops. Great flight home on the 787-9 making up some time. Certainly not an easy time for TUI but seem to be doing there best.