Step 1 : Introduction to the question "What passenger on United Airlines Flight 93 famously declared 'Let's Roll!' during the September 11 attacks?""
...Todd Beamer was a passenger on United Airlines Flight 93, one of the four planes hijacked during the September 11, 2001, terrorist attacks. He became known for his heroic actions as he and other passengers attempted to regain control of the plane from the hijackers. During a phone call with a GTE Airfone operator, Beamer famously said, "Let's Roll!" — a rallying cry for their effort to thwart the hijackers' plans. Their courageous actions led to the plane crashing in a field near Shanksville, Pennsylvania, preventing it from reaching its intended target.