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    Massachusetts jet breaks sound barrier over Vermont, N.H.

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    A Massachusetts Air National Guard fighter jet flying a routine training mission over the New Hampshire-Vermont border has inadvertently broken the sound barrier. The National Guard said the pilot of the F-15C Eagle was completing qualification training in a controlled military airspace Thursday when he flew at just under 700 miles per hour at 20,000 feet above sea level. The area is not among those designated by the Air Force for supersonic flights. Residents of the Vermont city of Bradford and the New Hampshire communities of Lyme and Orford may have heard the resulting sonic boom. Dispatchers at the Hanover, N.H., police department told the Valley News of Lebanon, N.H., that they received 15 calls related to the boom. (AP)