Abstract: Described herein is an apparatus that includes a disruption severity module and flight recommendation module. The disruption severity module calculates a disruption severity index value associated with an unscheduled maintenance event of an aircraft. The disruption severity index value is calculated based on a plurality of flight operation factors affected by the unscheduled maintenance event. The flight recommendation module recommends one of resolving the unscheduled maintenance event of the aircraft before a subsequent flight of the aircraft or flying the aircraft without resolving the unscheduled maintenance event of the aircraft based on the disruption severity index value.