Each year since 9/11, StoryCorps are honouring the day by featuring stories from the parents, wives, husbands, coworkers, and friends of those who perish on 9/11. This year we hear from Vaughn Allex, a man whose life was affected in another way.

Vaughn was working at the American Airlines ticket counter at Dulles International Airport outside of Washington, D.C., on the morning of September 11 checking in passengers on Flight 77.

As he was wrapping up, two men who were running late for the flight came to his counter.

Before the creation of the Transportation Security Administration (TSA), airport security was more lax, and Vaughn did exactly what he was supposed to do — he checked both men’s IDs, asked them a few standard security questions, and then flagged their bags for extra scrutiny.

Vaughn then checked the two men in and they boarded the flight to Los Angeles.

Those two men were among the five who rerouted the American Airlines Flight 77 to the Pentagon.

Vaughn, who retired from the airline industry in 2008 and now works for the Department of Homeland Security, came to StoryCorps with his wife, Denise, to discuss how he has felt since learning the next day that he checked in two of the 9/11 on American Airlines Flight 77.

Originally aired September 9, 2016, on NPR’s Morning Edition.