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"Chicago's United Airlines says it is keeping its fleet of Boeing 787 airplanes grounded until June 5 over concerns about the aircraft's battery system."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.upi.com/Top_News/US/2013/02/22/United-grounds-Boeing-787/UPI-58281361558117/?rel=96091362067803>