The Coast Guard had concerns about the SS United States' scheduled move from Pier 82 to Pier 80 in Philadelphia, sources said.

In the next few days, the SS United States will be towed out of the Delaware River for the final time. Here are the details. Often called "America's flagship," the SS United States is a marvel of engineering, the longest and largest ocean liner ever built in America and holder of a transatlantic naval speed record that remains unbroken to this day.

The SS United States, a staple in South Philadelphia's Navy Yard, will begin its final journey this weekend to become part of the world's largest artificial reef.