He called using a seat-back phone on the plane before it crashed, 9/11 Museum and Memorial says. The museum has kept Sweeney's message as a part of its collection.
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Julie has since remarried and had two children. She is still connected to the 9/11 Memorial & Museum, working as a volunteer.
The North Tower lasted around 46 minutes longer than its twin, having been struck 17 minutes before the South Tower was attacked and standing another half-hour after the South Tower collapsed.
9:59:00: The South Tower of the World Trade Center collapses, 56 minutes after the impact of Flight 175. Impact speed is considered one of the likely factors during its much faster collapse unlike that of the North Tower.