Decisal is a company that sprung-out of Imperial College London when PhD students invented several novel algorithms for airline planning and scheduling optimization. These algorithms are now helping airlines improve their operations and as a result save millions every year. Before Decisal’s algorithms, airlines in order to reduce complexity were forced to separate fleet and network planning, as well as fleet, aircraft, and crew scheduling. However, all these processes are interdependent and such separation was unable to capture their mutual interaction and contribution to profitability. Decisal’s novel algorithms now provide airlines with Unified Optimization where all planning and scheduling steps are tackled simultaneously, accounting for these interactions and resulting in an overall profit maximization.