They will start with 4 or 5 A320s (probably leased from Iberia) and they will increase their fleet to about 30 A320s during the first year

Keep calm !...
there is already Ryanair, Vueling and Easyjet which is about to get a base in MAD, so if CATAIR is successful that much, it will be great, but I dont reckon so

..
What about Air Nostrum which is now planing to get only CRJ 900s and leave the turboprop fleet to Denimair ? who will suffer more ? ANS or CATAIR ?