Fuel economy is becoming a selling point for some environmentally conscious air travelers as airlines increasingly work to improve efficiency and save costs, this article reports. The average U.S. carrier got 64 miles to the gallon per seat in 2009, according to data from the Department of Transportation. Single-aisle jets such as the Boeing 737-900 and Airbus A320 often outperform large jets as well as regional planes when it comes to fuel savings.

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