Traortation has always been one of the basic human needs and its development as an industry has especial economic, social and political consequences. Air traort through his unique characteristics such as speed, easy movement of passengers and cargo in a wide geographical area, access to faraway regions and many other reasons in comparison with other modes of traort, has an important position. Competition in the air traort industry has been always increasing and demand is very sensitive to changes. These changes have caused the importance of identification of the performance of airlines and awareness of their position in comparison with other airlines. Every manager needs to know information about his organization performance and always try to improve his organization performance. But this improvement is going to happen only by having sufficient knowledge about other competing organizations. This recognition helps that each unit of the organization become aware of the current situation. By considering the current situation, and applying appropriate methods, achieves acceptable level of activity and performance. Considering the effect of the appropriate performance evaluation on successful management, the aim of this study is to identify and analyze the factors affecting the performance of local companies in international flights output. Therefore, by using flight information database of Imam Khomeini Airport (IKA) during four years (1388 to 1392), the performance of active companies in indexes such as the number of departure flights and passengers, traorted load and mail, passenger occupancy rate, number of flight paths and the average delay of each flight was compared. The most important result of this study showed that local and foreign companies at IKA has equal share and foreign companies have a better performance than local companies in all the reviewed indexes, and Iran is a good market for this companies. Afterwards for identifying effective factors in passenger behavior for choosing companies indexes introduced in similar studies was identified. Then, through interviews with IKA passengers, 21 factors were surveyed to recognize effective factors in the Iranian traveler’s opinion, according to their trip purpose, income and type of local or foreign companies. The most important factors in choosing the company are flight security and safety, the new fleet and direct flights between origin and destination, therefore local companies by investing in these items can increase passenger satisfaction and have a larger share of the market. Based on the factors identified by the passengers' behavior and flight information database, relative efficiency of 27 local and foreign airlines that moved more than 90 percent of passengers on international routes during 1388 to 1392, was calculated by using data envelopment analysis method and ranked with Anderson-Peterson method. The results showed that Mahan Company is the best local company in terms of performance, and always been in second or third place ?!and Iran Air company has never been in a place better than fourth (in this 4 years period) and the efficiency of this company decreased so that its rank in 1392 reached 10. Finally, for each inefficient local company, to enhance efficiency and increase their share of the market, some primary and cross-sectional solutions was offered based on age and number of fleet, passenger occupancy rate and number of passengers. Keywords : Air traortation, performance evaluation, airlines, DEA, Imam Khomeini Airport.