NEW YORK, Sept 11 (Reuters) - Twenty years after hijacked airliners smashed into New York City's World Trade Center and the Pentagon outside Washington, Americans came together on Saturday to honor the nearly 3,000 lives lost on Sept. 11, 2001, and reflect on how the attacks have shaped the country's view of the world and itself. With President Joe Biden on hand, the ceremony at the Sept. 11 Memorial in New York City began with a moment of silence at 8:46 a.m. EDT (1246 GMT), the exact time the first of two planes flew into the World Trade Center's twin
