A Federal Aviation Administration (FAA) internal memo warns that small knives have been used in hijackings. The memo states, “Small knives (blade length of four inches or less), the most frequently employed weapon to hijack aircraft (in the US), were used in three incidents.” Details of the memo will later be provided to the 9/11 Commission by Steve Elson, an FAA special agent for security. According to Elson, the memo is widely distributed to agency security officials. Elson will quit the FAA 1999 in frustration over lax security. [New York Magazine, 9/24/2001; Elson, 9/4/2003; Salon, 8/3/2004; Linda Ellman, 2005; Village Voice, 2/8/2005] By 9/11 it will still be legal to bring small knives onto planes (see July 8-August 30, 2001).