The interview has 2 rounds. First is more of HR round where they ask questions on your resume. Also asked what are the features/type of population in airline industry. What are the problems. Second interview was market sizing question where they asked how many swipes in a day in the NYC subway. Person helps you with the answer

First round interview began with two phone calls, each around 30 minutes. First was a business case dealing with churn and how to stop it for an online dating site. It involved some easy math and you had to talk about ways to stop churn and data you might want. The second was a fit interview, all pretty basic stuff, like why consulting, etc. In person interview about 2 weeks later. It consisted of 3 interviews, each about 45-60 minutes. First interview had some fit elements and a brief case about credit card fees and attrition. Second interview was a supply chain case (which was very confusing if you're not familiar with the terminology, and the interviewer was seemingly very pressed for time and really rushed me through it, which I think took away from the interview overall). Final interview was mostly fit with a brainteaser thrown in. Heard back from them about a month or so after my in person saying I was not going to be made an offer.