The pie charts compare the percentage of reasons for flight delays in a particular Asian country over two years, 2015 and 2016.
It is evident that the most significant reason for these delays was airline operations management, accounting for nearly half of the pie chart in both years. Additionally, the number of flight delays caused by air traffic control decreased the most from 2015 to 2016 compared to other causes.
In 2015, the primary reasons for flight delays were airline operations management, air traffic control, and bad weather, with a combined total of 86% on the pie chart. They accounted for 40%, 25%, and 21% respectively. The remaining two causes, military factors and airport security, represented only 10% and 4% of the total respectively, indicating less frequency compared to other causes.
In 2016, flight delays due to airline operations continued to be prominent. However, there was a notable shift as the percentage of flight delays caused by air traffic control sharply decreased from 25% to 12% in just one year. Conversely, airport security saw a rapid increase to 13%, surpassing air traffic control. Air traffic control thus became one of the three main causes of flight delays.