Evaluating the Efficiency of Airline Companies with the Goal of Reducing the Potential for Global Warming Using a Robust Two-Stage Data Envelopment Analysis Method with Unfavorable Output

e aviation industry is expanding rapidly around the world, and the efficiency of airlines has been of interest since the industry's inception. Nonetheless, despite increased revenue, the aviation industry has contributed to environmental degradation in recent years. As a result, this industry requires businesses that reduce their environmental impact while increasing their profits. With this topic in mind, a twostage robust data envelopment analysis model with unfavorable output is presented to evaluate the performance of airline companies according to their internal structure with the aim of increasing the final revenue of the system and reducing the unfavorable output of global warming potential and uncertainty in the warming potential. The purpose of this article is to assess the efficiency of 11 airlines during the years 2010 to 2019. Through these models, it was concluded that most of the United States airlines are relatively efficient and their average overall efficiency score is above 0.8. Only two companies, Spirit and Allegiant, have a lower average total efficiency. On the other hand, all the companies in the first stage are relatively efficient and have an average efficiency score above 0.8, and except for the two companies Spirit and Allegiant, they are also efficient in the flight sector and have an average above 0.9. The overall performance of companies is more affected by the performance of their flight department.