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دانلود رایکان مقاله انگلیسی ISI با موضوع ارزیابی بازده انرژی برای خطوط هوایی: کاربرد روش VFB-DEA

عنوان فارسی مقاله:

ارزیابی بازده انرژی برای خطوط هوایی: کاربرد روش VFB-DEA

عنوان انگلیسی مقاله:

Evaluating energy efficiency for airlines: An application of VFB-DEA

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3. Results

3.1. The data

An empirical study in this paper will be performed with the data of a five-year period, from 2008 to 2012. Since 2008, the financial crisis in the U.S. has deeply affected the global airline and the energy markets. To minimize the effect of the financial crisis, many airlines anchor their hope on improving overall efficiency, and on account of the increasing energy price, energy efficiency has become an important consideration. It is meaningful to study the energy efficiencies of some of the major airlines during this period. The empirical data are obtained from 11 airlines: China Eastern Airlines, China Southern Airlines, Air China, Hainan Airlines, Korean Air, Qantas Airways, Air France-KLM, Lufthansa Airlines, Scandinavian Airlines, Delta Air Lines and Alaska Airlines. Out of these 11 airlines, the passenger capacity of five ranked in the top 10 worldwide, in 2012 (Delta Air Lines, Lufthansa Airlines, Air FranceKLM, China Eastern Airlines and China Southern Airlines). These 11 airlines come from Asia, America, Europe and Oceania, so they are representative of global airlines to a certain degree. For simplicity, this paper has not considered the impacts of different company types, such as the difference between low-cost carriers and full service carriers. The data on number of employees, capital stock, total business income, Revenue Ton Kilometers and Revenue Passenger Kilometers are collected from the annual reports. The data on tons of aviation kerosene and CO2 emission volume are taken from the sustainability, environment and corporate social responsibility reports of the 11 companies.