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Smoke, flames and debris erupt from the South Tower as United Airlines Flight 175 hits. This flight was on route from Logan International Airport in Boston, Massachusetts to Los Angeles International Airport in California, the same path as the other plane that struck the North Tower.

Smoke and flames as plane hits South Tower - Photos - Remembering the Sept. 11 terrorist attacks

Smoke, flames and debris erupt from the South Tower as United Airlines Flight 175 hits. This flight was on route from Logan International Airport in Boston, Massachusetts to Los Angeles International Airport in California, the same path as the other plane that struck the North Tower.

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Lembre-911,World Trade Center,11 De Setembro,Eventos Atuais,United Airlines Flight 175,Airline Flights,It's Coming

The South Tower of the World Trade Center explodes in flames after being hit by the hijacked airliner now universally known as "the second plane," United Airlines Flight 175, September 11, 2001.

The South Tower of the World Trade Center explodes in flames after being hit by the hijacked airliner now universally known as "the second plane," United Airlines Flight 175, September 11, 2001.

Hijacked United Airlines Flight 175 (L) flies toward the World Trade Center twin towers shortly before slamming into the south tower (L) as the north tower burns following an earlier attack by a hijacked airliner in New York City September 11, 2001. The stunning aerial assaults on the huge commercial complex where more than 40,000 people worked on an ordinary day were part of a coordinated attack aimed at the nation's financial heart. They destroyed one of America's most dramatic symbols of…

Hijacked United Airlines Flight 175 (L) flies toward the World Trade Center twin towers shortly before slamming into the south tower (L) as the north tower burns following an earlier attack by a hijacked airliner in New York City September 11, 2001. The stunning aerial assaults on the huge commercial complex where more than 40,000 people worked on an ordinary day were part of a coordinated attack aimed at the nation's financial heart. They destroyed one of America's most dramatic symbols of…

25 Most Powerful Photos : Hijacked United Airlines Flight 175 from Boston crashes into The South Tower of The World Trade Center and explodes at 9:03 am September 11,2001 in New York City,U.S.A.(Note: Now know all over the world as 9-11)

25 Most Powerful Photos : Hijacked United Airlines Flight 175 from Boston crashes into The South Tower of The World Trade Center and explodes at 9:03 am September 11,2001 in New York City,U.S.A.(Note: Now know all over the world as 9-11)

United Airlines Flight 175 heading towards the south tower of the World Trade Center / this article is a whole collection of stories and quotes from the Columbia Center for Oral History / "What is amazing is that in that moment, there was a moment before — that we saw that plane, that second plane — and there was a moment after, and it’s like two different worlds, those two moments. I mean, literally, I can feel like I can remember the exact second when the whole world chang...

Witness to Apocalypse

United Airlines Flight 175 heading towards the south tower of the World Trade Center / this article is a whole collection of stories and quotes from the Columbia Center for Oral History / "What is amazing is that in that moment, there was a moment before — that we saw that plane, that second plane — and there was a moment after, and it’s like two different worlds, those two moments. I mean, literally, I can feel like I can remember the exact second when the whole world chang...

American Airlines Flight 11, World Trade Center North Tower - United Airlines Flight 175, World Trade Center South Tower - American Airlines Flight 77, Pentagon  - United Airlines Flight 93

American Airlines Flight 11, World Trade Center North Tower - United Airlines Flight 175, World Trade Center South Tower - American Airlines Flight 77, Pentagon - United Airlines Flight 93

United Airlines Flight 175 Reconstruction with ATC Recording - September 11 2001

United Airlines Flight 175 Reconstruction with ATC Recording - September 11 2001

In honor of the thirty-three heroes, the flight crew on 9/11:  American Airlines Flight 11  United Airlines Flight 175  American Airlines Flight 77  United Airlines Flight 93

Our 33

In honor of the thirty-three heroes, the flight crew on 9/11: American Airlines Flight 11 United Airlines Flight 175 American Airlines Flight 77 United Airlines Flight 93

Hijacked United Airlines Flight 175 from Boston crashes into the south tower of the World Trade Center and explodes at 9:03 a.m. on September 11, 2001 in New York City.

15 years after 9/11 those who lived say time doesn't mellow the grief

Hijacked United Airlines Flight 175 from Boston crashes into the south tower of the World Trade Center and explodes at 9:03 a.m. on September 11, 2001 in New York City.

United Airlines Flight 175 - ATC Recordings 9/11 [PART 2/2] [MID-AIR HIJACKING] - YouTube

United Airlines Flight 175 - ATC Recordings 9/11 [PART 2/2] [MID-AIR HIJACKING] - YouTube

Lisa Frost  Lisa Frost (SHA '01) Lisa Frost, 22, of Rancho Santa Margarita, California, graduated from Boston University this year, with degrees in communications and business hospitality. She is survived by her father, mother and brother. Frost was a passenger on United Airlines Flight 175.

Lisa Frost Lisa Frost (SHA '01) Lisa Frost, 22, of Rancho Santa Margarita, California, graduated from Boston University this year, with degrees in communications and business hospitality. She is survived by her father, mother and brother. Frost was a passenger on United Airlines Flight 175.

Always Remember by Christine [©2007-2014 Chrippy] | Names from the Pentagon, American Airlines Flight 11, United Airlines Flight 175, American Airlines Flight 77, and United Airlines Flight 93

Always Remember by Christine [©2007-2014 Chrippy] | Names from the Pentagon, American Airlines Flight 11, United Airlines Flight 175, American Airlines Flight 77, and United Airlines Flight 93

United Airlines subway ad right at Ground Zero.  Oops.  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.

12 More Funny/Unfortunate Billboard Placements

United Airlines subway ad right at Ground Zero. Oops. 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.

FILE - In this Tuesday, Sept. 11, 2001 file photo, United Airlines Flight 175 approaches the south tower of the World Trade Center in New York moments before collision, seen from the Brooklyn borough of New York. (AP Photo/ William Kratzke) (Credit: AP)

FILE - In this Tuesday, Sept. 11, 2001 file photo, United Airlines Flight 175 approaches the south tower of the World Trade Center in New York moments before collision, seen from the Brooklyn borough of New York. (AP Photo/ William Kratzke) (Credit: AP)