One more vote for C. Cage. She used to be an interviewer at United. She's been around the block more than a few times. I met her at her office in Denver, and she helped me with my interviewing skills. She's sharp, and her books are right on. This isn't just an interview, it's an airline interview. She lays out the differences and the nuances.

Technical knowledge is black and white. You can't message it much. Situational questions can be told in a number of differnt ways, many ways that can totally score, or totally destroy you. THIS is a skill that needs practical advice and practice!!