What system provides data regarding the aircraft's performance during flight?

The Flight Data Monitoring System is designed specifically to collect and analyze data regarding the aircraft's performance during flight. It continuously records critical flight parameters, enabling operators to monitor performance metrics and ensure they remain within safe operational limits. This system also helps in identifying trends in aircraft operation and performance, which can be vital for safety audits, maintenance scheduling, and operational efficiency.

In contrast, the Flight Management System primarily aids in navigation and flight planning but does not focus on performance metrics specifically. The Instrument Landing System is a ground-based system that provides guidance to pilots during the approach and landing phases but does not monitor flight performance. Lastly, the Weather Radar System provides real-time information about weather conditions but does not collect data related to the aircraft's performance during flight.