Several weeks after anonymously posting a video on YouTube pointing out flaws in security at San Francisco International Airport, airline pilot Chris Liu has come forward to defend his actions.

Liu, who works for American Airlines, said he didn't think the video would get much notice. Too his astonishment, it went viral.

"There have been numerous articles written about this security problem, and I just wanted to address it," the 50-year-old aviator told ABC's "Good Morning America". "I didn't really think that anybody was watching YouTube, so I didn't really think much of it."
    
In the video, Liu pointed out the disparity between the airport's upper level, where passengers face body scanners and pat downs and the lower level, where airport workers simply swipe a card.

"As you can see airport security is kind of farce," he said in the video, which was posted in late November.

"This was never about being famous for me," Liu, a Colfax resident, said at a news conference on Tuesday with his wife, Sandra, by his side. "This was about aviation security."

"All I'm looking out for is the flying public," he explained. "I just want to start from point A and go to point B and if the flight is really boring, I've achieved my mission."

Liu's mission, however, may have landed him in legal hot water. When his video appeared on YouTube, six federal agents came to his home. Liu could now face charges for sharing security secrets.