In this study, energy, environment and enviroeconomic analyses are applied to the turbofan engine used in aviation industry. The CO 2 emissions of the turbofan engine are calculated and cost of the CO 2 emissions for a daily period are evaluated. The energy efficiencies of the overall turbofan engine system, high pressure turbine, low pressure turbine and the combustion chamber are found as 19.7%, 26.2%, 29.2% and 90%, respectively. The CO 2 emissions releasing in a day are calculated as 358.9 tonCO 2 /day, while the CO 2 emissions price in a day are calculated as 5742.52 US $/day for the turbofan engine. Also, 3.35 kg carbon dioxide is released into the air as a result of 1 kg of kerosene burning. Environmental and the enviroeconomic results of this study can be useful for developing environmentally sustainable turbofan engines as well as for researches and designers in aviation industry.

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