150414_nyt_bluebird_857.jpg | Kevin D. Liles Photography

Phil Horlock, president and CEO of Blue Bird, talks about the advantages of propane-powered school buses during an interview in his office on Tuesday, April 14, 2015 in Fort Valley, Ga. Photo by Kevin Liles for The New York Times

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Phil Horlock, president and CEO of Blue Bird, talks about the advantages of propane-powered school buses during an interview in his office on Tuesday, April 14, 2015 in Fort Valley, Ga. Photo by Kevin Liles for The New York Times