On May 26, the Civil Aviation Authority issued the "2014 Report of the national civil aviation flight operations efficiency." The report shows that in 2014, the flight distance between domestic cities mainly concentrated in the scope of 400 to 1,800 kilometers,taking up about 82% of the annual flights :the amount of flight take-off and landing flights is 7.5 million  ,the average amount of daily flight  is over 1000, in which a large quantity of flight hours mainly are in summer, during the spring; 15 hours that are from 7:00 to 22:00 every day during is busy hours; since 2011, fuel cost of average unit declines year by year.