US Airways American Customer Satisfaction Index by the University of Michigan, US Airways ranked last in customer satisfaction among the major airlines. However, it was making steady ground to bridge its gap with other airlines. In late 2008, US Airways closed its Las Vegas hub, which was part of the America West network. On January 15, 2009, US Airways Flight 1549, under the command of Captain Chesley Sullenberger, flying from New York City's LaGuardia Airport to Charlotte Douglas International Airport, ditched into the Hudson River shortly after takeoff. Multiple bird hits from a flock of Canada geese caused both engines to lose
Flock (birds) success rate when attacking the flock, rather than increasing the ability of the flock to spot an approaching predator. By birds co-existing with one another in a flock, less time and energy is spent searching for predators. This mutual protection of one another within the flock is one of the benefits to living within a group. However, as flock numbers increase the more aggressive individuals within the flock become towards one another. This is one of the costs to living within a flock. It is often seen that flocks are dynamic and thus fluctuate in size depending on the needs