Non-dimensional simulation models are often used to interpret experimental data in order to better understand the combustion processes. Recent investigation has presented a thermodynamic non-dimensional model which is used for evaluating the emitted greenhouse gases of a turbofan engine at flight altitude. Combustion chamber flow has been modeled as a non-dimensional flow in provided model. Required data for this model are combustion chamber inlet, turbine inlet and outlet together with exit nozzle pressure and temperature which are calculated by gas turbine non-dimensional modeling software. In this regard mass flow and rotational speed compatibility, conservation of mass and energy equations have been solved. (GSP and KineTechs software (chemical kinetic solving software) have been used for solving the mentioned equations as well as modeling the non-dimensional flow in the combustion chamber, respectively.) This paper investigates the JT9D engine. The results have been validated with experimental data published by International Civil Aviation Organization (ICAO). Noteworthy is that the obtained experimental data have been considered for low flight altitude phases and therefore the presented model takes into account the Greenhouse Gases estimation values for the mentioned phases. After result validation and conformity of experimental data, engine cruise altitude conditions have been modeled. Subsequently, New York – London airway has been studied and emitted Greenhouse gases quantity at cruise altitude has been calculated in one year while verified with published official Statistical data.