40-year-old Alain Ghonda, a consultant from Silver Spring, Maryland who was a passenger on Flight 253, said he travels the world with heightened awareness since the failed attack.
"After having that experience, you do not know who's sitting next to you," Ghonda said before Thursday's hearing. "They may look like passengers, but they might want to harm you," according to USA Today.
In addition to passengers, the case had become a turning-point for security screening at American airports.
Abdulmutallab's ability to elude security in Amsterdam contributed to increased usage of full-body scanners at U.S. airports.
The Transportation Security Administration had been using the scanners in some American cities at the time, but the attack sped-up their placement.
Now, there are hundreds of screening devices nationwide.