SAN FRANCISCO - FEBRUARY 04: A Coast Guard helicopter files next to the Golden Gate Bridge as the Queen Mary 2, the largest ocean liner in the world, sails under the Golden Gate Bridge into the San Francisco Bay on February 4, 2007 in San Francisco, California. The Queen Mary 2, a 151,000 ton, 1,132-foot-foot-long ship, is the largest vessel to sail through the Golden Gate and San Francisco Bay and is on an 81-day maiden world cruise. (Photograph by David Paul Morris)