There have been a few occasions over the years that a safety issue has been overlooked or neglected that I felt it was necessary to file a DOT complaint or notify the FAA.

http://www.faa.gov/contact/safety_hotline/

The FAA makes it pretty easy.

The fun part is that if you choose to not remain anonymous, the airline will respond very quickly and from the upper management level.

I had a flight a couple of weeks ago on a different AAirline. Issue was minors (clearly under 15years old) in exit row and no briefing by geriatric, aloof crew. Complaint filed on a Monday. Phone call from someone in the "Executive Offices" on Friday morning.