United Airlines Flight 175 flies low toward the South Tower of the World Trade Center, shortly before slamming into the structure. The north tower burns after an earlier attack by a hijacked airliner in New York City, on September (Reuters/Sean Adair)
The East River. The East River is a salt water tidal estuary in New York City. The waterway, which is actually not a river despite its name, connects Upper New York Bay on its south end to Long Island Sound on its north end.