We've assembled a collection of maps and info-graphics that we hope will help to clarify what has happened with the September 11th attacks.

The September 11th Attacks
Tracking the Flights
Take a look at the actual flight paths of the ill-fated flights of September 11th vs. the intended ones in this step-by-step interactive map.
Source:     Sun Sentinel
 
Interactive Attacks Explanation Map
CNN created this wonderful interactive map, which shows the route of the planes that attacked the World Trade Center and the Pentagon, as well as the plane that crashed in Pennsylvania. Clicking on the various links takes you to additional interactive explanations of the events.
Source:     CNN
 

News Graphics  - America At War
Explore the attacks of September 11th and the War in Afghanistan through this extensive collection of maps and interactive presentations.
Source:     The Washington Post
 

Explore the attacks on September 11th The following set of maps show the effects of the attacks on September 11th, and supply information on Afghanistan and subsequent military operations. The following maps have been posted: * Location of the World Trade Centers * Third building collapses * Location of the Pentagon * Aerial Photographs of the World Trade Center * Before * After * Aerial Photographs of the Pentagon * Before * After Additonal Maps of Interest * Location of the Somerset County, PA plane crash * Afghanistan * Kabul Source: Maps.com