US airlines operating in the domestic market showed a wide gap in fuel efficiency, with Alaska Airlines taking the top ranking, according to a study. The International Council on Clear Transportation (ICCT) measured fuel efficiency of 15 US airlines in 2010 and found a 26 percent difference between the most fuel-efficient and the least fuel-efficient airlines. (airguideonline.com) さらに...
The devil is in the details....
https://theicct.egnyte.com/h-s/20130905/a49d845fc3e34fd1