FILE - In this April 29, 2014 file photo, a broken blade is seen on a 300-foot wind turbine south of Highmore, S.D., where a single-engine Piper crashed in foggy weather Sunday evening April 27, 2014, killing the pilot and three cattlemen. Federal data indicate that wind turbines are not a major cause of airplane crashes, a conclusion that doesn't surprise a leading wind energy company. A National Transportation Safety Board database lists only two crashes in which a plane struck a wind turbine _ one in Palm Springs, California, in 2001, and the one near Highmore in late April. (AP Photo/Capital Journal, Joel Ebert, File)
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