Airline efforts to fend off the building pressure to penalize the industry for aircraft noise and emissions run into two key difficulties. First, as anyone familiar with the evolution of turbine aircraft powerplants can attest, the road to a cleaner engine is very rough indeed, with much money and time required to achieve each step of improvement. Second, visible signs of progress are hidden deep within the engine's guts with the exception of noise, which at least has some visible changes in ...

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