Ellen Saracini is trying to get support for legislation for planes to have another barrier to protect airliner cockpits from hijackers.
She met with the head of United Airlines on Wednesday.
Her husband Victor was the pilot of United Airlines Flight 125 on the day of the terrorist attacks.
"We lost 2,923 people on September 11, one of them being my husband. Really, I have to do this because he has no voice. I will speak for him and all the other victims," said Ellen Saracini.
Saracini says United has removed secondary barriers from its new Dreamliners.
The airline has said the barriers are only one element of flight safety, and those elements vary depending on the type of plane.