Carrier-related delays are the leading cause of flight delays. This typically includes airline-related issues such as crew shortages, aircraft maintenance, and operational decisions.
Weather delays are the second highest, showing how seasonal or unexpected weather conditions significantly affect flight schedules.
NAS (National Aviation System) delays rank third, often linked to airspace congestion, air traffic control decisions, and airport operational limits.
Security delays are minimal, indicating relatively smooth security screening processes at the departure and transit points.
Late aircraft arrival is the least frequent cause, suggesting upstream delays (from previous flights)