The provided pie charts illustrate the distribution of various factors leading to flight delays in a specific Asian country during the years 2015 and 2016.
Overall, the predominant cause of flight delays in both years was airline operations management, with a notable decrease in delays attributed to air traffic control from 2015 to 2016.
In 2015, airline operations management accounted for 40% of delays, followed by air traffic control at 25% and bad weather at 21%. Military factors and airport security constituted 10% and 4% of delays, respectively. These three major factors, airline operations management, air traffic control, and bad weather, collectively contributed to 86% of all flight delays in 2015.
In contrast, in 2016, airline operations management remained the primary cause of delays at 46%, while air traffic control experienced a substantial decrease to 12%. Bad weather accounted for 23% of delays. Notably, airport security saw an increase to 3%, surpassing military factors to become one of the significant reasons for flight delays in 2016.