All U.S. airlines are taking steps to increase fuel efficiency of aircraft by introducing innovations such as slimmer seats and winglets. "Most of our capacity growth in the past couple of years has been through adding gauge to aircraft and utilizing our aircraft more and putting more seats on the airplane," said Scott Kirby, president of US Airways. United Airlines revealed the slimmer seat designs it will roll out on 500 of its planes, saying the airline is "focused on customer comfort, revenue generation and fuel efficiency." United is also the first airline to test a new winglet design that is expected to save nearly $200 million in annual fleet fuel costs.

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