MYT use futura during the winter to ACE and XL during the summer to PMI (formerly using Spanair in previous years)
MYT have an allocation on some TOM/FCA flights but as far as im aware, other carriers dont use an allocation on MYT's flights, its all MYT tour operators and flights are generally full.
The logical view of it all - This year -
TCX mainly use FCA
TOM use TOM/AEA/FCA
MYT mainly use MYT, with some allocs on FCA&TOM and the subbed PMI route with XL.
FCA use FCA
Next year -
FCA and TOM will use each other on TOM's a/c
MYT and TCX will use each other on MYT's a/c
If MYT can sustain an A321 by themselves, then with TCX they could probably support x2 A320's, but will definately support one a/c.
Thats my simple opinion, but as we all know this industry isnt that simple and this idea may not be viable.
The opinion that CWL has a stronger charter market is probably assumed because the majority of CWL's business these days and in recent years has been charter business. Lets face facts, BRS is way ahead of CWL in most areas and CWL has a long way to go to catch up.
As for MIR, this was operated by Karthago on behalf of TOM and MYT, and is not yet on sale for TOM either.
From the schedule on MYT's website, everything is practically the same as it was this year, with the exception of Sanford being on their own a/c ( at the moment)
MYT is here to stay and as TCX dont have an a/c at BRS or CWL during summer, this is probably where the extra a/c will come from.