How many airplanes wrecked on 911?

Unfortunatly there were four airplanes that were brought down on 9/11/01. The first was American Airlines Flight 11, which was flown into World Trade Center 1. The second was United Airlines Flight 175, which was flown into World Trade Center 2. The third was American Airlines Flight 77, which was flown into the Pentagon. The last plane to wreck was United Airlines Flight 93, which landed in a field on the outskirts of Shanksville, Pennsylvania.