| http://www.w3.org/ns/prov#value | - FLAGSTAFF, Ariz. -- Despite the alarms raised by Sunday's fatal helicopter collision over Flagstaff, federal safety officials acknowledge that none of the major reforms outlined in a 2006 report would likely have prevented the crash.The incident was a rarity - it marked only the second time in 23 years that two emergency medical service aircraft had collided in midair, officials said Tuesday.
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