一、背景航班正常性统计的传统作法是航管部门每天将飞行情况重新作一次手工记录，对延误或取消的航班分类统计，由于客观或主观因素的制约，有时候一星期甚至一个月才作一次汇总，对情况不明的航班因不能及时查明有关情况只好作罢，造成人为因素作用过大甚至起着主导作用。长 First, the background of the normal statistics of the flight The traditional approach is the daily flight of the navigation department to make a manual record of flights, delayed or canceled flights statistics, due to objective or subjective factors, sometimes a week or even a month before Once summarized, the unidentified flight was abandoned because of the inability to identify the relevant situation in time, causing the human factor to play an overriding role and even playing a leading role. long