Incident Date: September 11, 2001
- American Airlines Flight 11, World Trade Center North, New York
Two of the hijackers first went through security at Portland International Jetport in Maine for their flight to Boston. Then all the hijackers on this flight gained access to AA Flight 11 gate through Globe Security under a contract with American Airlines at Boston Logan International Airport.
- United Airlines Flight 175, World Trade Center South, New York
Huntleigh USA performed the screening for this flight at Boston Logan, controlled by United Airlines.
- American Airlines Flight 77, Pentagon, Arlington, Virginia
Argenbright Security screened the hijackers for this flight at Washington Dulles International Airport in Virginia under contract with United Airlines.
- United Airlines Flight 93, near Shanksville, Pennsylvania
The hijackers were screened by Argenbright Security at Newark International Airport, controlled by United Airlines.

