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)
United Airlines subway ad right at Ground Zero. United Airlines flight 175 landed into the south tower of the World Trade Center. The ad was quickly pulled. A United Airlines spokesman said the airline was not aware of the ad's placement.
, five alleged hijackers crashed American Airlines Flight 11 into the World Trade Center’s North Tower WTC), and at a., another five alleged hijackers crashed United Airlines Flight 175 into the South Tower WTC).