PAJ,
As others have said on here, it's pointless working on specific "CTC" questions. Competency based questions are the norm for most job interviews and are straightforward to prepare for, as they are all about you. The industry and flying aspects are covered in people's previous posts.
There's a lot of questions CTC could ask you, and they apparently keep their eye on here, so anything posted would probably end up not being asked, and your efforts to prepare for such questions may ultimately be wasted.
Focus on building a rounded awareness of the major issues in the industry within Europe, now and over the last few years, the partner airlines and general flying stuff. You probably won't know everything, but they don't expect you to. If you have a decent level of familiarity, you can reason over questions you don't know outright.
Critical of course to be prepared for and know how to handle competency based questions. You need to communicate who you are, what your achievements have been and how you went about achieving them in the short amount of time allocated to your interview.
What I have just explained is essentially what CTC told us to do at stage 2 in preparation for stage 3. Trust me, it's true.
Best of luck.