HH6702,
It is unlikely that Thomsonfly will operate ski flights on a tues, where one of the gaps appear. Generally the winter is relatively quiet for charters at NCL, so the aircraft could well be on the ground.
XLA based aircraft for Winter 06/07 is nowhere near confirmed yet, indeed they have not yet finalised the S06 based programme. However, should they have a based aircraft then quite possibly the Thomson hols TCP flight will be op by XLA, though it is being sold as a TOM op flight. Provisionally XLA have flights on a Thu to SSH during W06/07.
With most programmes for S06 not yet finalised, be patient for W06/07.
XLA could very well operate the ski flights instead of BE/BA/SN who usually operate the ski programme. This would make an ideal programme for a based XLA a/c
