Agree that you should probably stay relatively high-level in your interview and not bore the interviewer(s) with detailed statistics/mathematics. Background knowledge in the theory and practice of yield management is great but I suspect they will ask you many "big picture" questions on how/why airlines make or lose money. Pricing and YM are only parts of the big picture. Expounding on the finer points of O&D versus leg based yield management won't win you as many brownie points as a solid understanding of the fundamentals of airline economics.

If you remember nothing else for your interview, one great piece of information to know and cite is: full flights are not always profitable ones!