The interview was with just one person and included an airline-based case study. A calculator was supposedly allowed, but it seemed to work against me. The interview questions were unremarkable, but the overall process felt uncomfortable. I was rejected immediately after completing the case study, during the same call. It seems that one person is in charge of the decisions for this role, which could explain why the position has been open and actively recruiting for 1.5 years. When asked about this, they said it was due to growth, but after the interview, it didn't seem to be the case.