Jan. 16, 2000: The number of cardiac surgeries at the New England Heart Institute in Manchester has dropped by 17% since the opening of rival centers in Concord and Portsmouth. The Manchester hospital has fought to prevent Concord and Portsmouth from performing heart surgeries since 1995, when they first asked the state for permission. Jan. 16, 1944: All flying and ground school aviation training is suddenly called to a halt at Concord Airport. A private flying school under contract with the government had turned out more than 650 pilots for the War Training Service. Jan. 16, 1991: New Hampshire,...