Federal Aviation Administration (FAA)
800 Independence Avenue, S.W.
Washington, DC 20591
Consumer Hotline: (800) 322-7873
Safety Hotline: (800) 255-1111
Online question form

U.S. Department of Transportation 
Aviation Consumer Protection Division
400 7th Street, S.W., Washington, DC 20590
(202) 366-2220

Handles complaints about airline safety and security, disability and discrimination, on-time performance, reservations and privacy. When appropriate, consumer complaints will be forwarded to the proper airline. Find out more and file a complaint here.