Today I did a case about the airline industry - should the company set up a transit airport? I didn't manage to solve this case, since I was not familiar with the industry and didn't even think about "loading factor". I used a structure of "benefit / cost" to discuss this case, but wasn't able to "drill down" to realize that having a transit airport could improve the loading factor.
My question is: given the above mention situation, how could I navigate the case? How should I drill down to find that loading factor could be improved, without knowing that loading factor is important for this industry? Also, can I ask what is the "operation metrics" of the airline industry in the beginning of the case, or the interviewer will assume I should know it?