Purposes

Safety Management System (like Flight Operation Quality Assurance - FOQA program in FAA, EASA, IOSA … regulations)
Advancing and changing flight operation policy trough improving Standard Operation Procedures
Improving of flight crew performance trough air carrier training programs.
Monitoring different aircraft systems and parameters, acting preventionaly on the bases of recorded data, following up changes after actions, and improving engineering Condition Monitoring Programs.
Establishing and advancing ( improving ) flight and maintenance procedures in order to reduce operational cost.