Amy Sweeney is known for her role as a flight attendant on American Airlines Flight 11, which was hijacked during the September 11 attacks in 2001. She played a crucial part in providing information to authorities about the hijackers and the situation on the plane, which helped in understanding the events of that tragic day. Sweeney's bravery and quick thinking were recognized posthumously, as she was one of the many individuals who lost their lives during the attacks. Her actions are often remembered alongside the stories of other heroes from that day, contributing to the collective memory of the September 11 attacks.