Tarrahan Parseh Transportation Research Institute International Journal of Transportation Engineering 2322-259X 6 3 2019 01 01 Determination of Effective Travel Variables on Air Transport Demand with Using Structural Equation 285 303 52976 10.22119/ijte.2017.52976 EN Mojtaba Moradi MSc. Grad., Department of Civil Engineering, Yazd University, Yazd, Iran Mohammad Mehdi Khabiri Associate Professor, Department of Civil Engineering, Yazd University, Yazd, Iran 0000-0003-3434-7603 Mohammad Saber Fallah Nezhad Associate Professor, College of Engineering, Yazd University, Yazd, Iran Journal Article 2017 05 14 Air transport system has always been involved in all aspects of life because of its high potential in transporting passengers and goods. In this research we surveys the effects of travel variables on demand of domestic air transport, and for gathering required information from passengers, a questionnaire was designed including 20 effective parameters on air transport demand with questions These parameters were investigated based on their importance using “Factor Analysis” and finally proved that the factors “price paid by passengers”, ”services offered by air transport system” and “time” has had the greatest impact on air transport demand with more than 20 % influence. “Structural Equation Modeling” has been used for checking the “Factor Analysis” results. The results of the model proved the correctness of factor analysis. Furthermore, the result of factor analysis has showed that the most important parameter has been “low cost travel” with the factor load of 0.9-1 in all case studies. Results show that both groups with factor load of more than 0.5 in the obtained factors have identified the factor “services” as the important and effective factor with the influence value of more than 20%. http://www.ijte.ir/article_52976_8157f8d9e5f3949e8d7225177897751a.pdf