To answer your question, you may send your complaint to:
Aviation Consumer Protection Division, C-75
U.S. Department of Transportation
1200 New Jersey Ave, S.E.
Washington, D.C. 20590
202-366-2220
Whether you call, write or use the web form, please be brief and concise in the description of your problem and be sure to include the following information:
your name
address
daytime phone number (including area code) and e-mail address
name of the airline or company about which you are complaining
flight date
flight number if known
origin and destination cities of your trip.
If you send us a letter, you should also include a copy (not the original) of your airline ticket or itinerary sheet and any correspondence you have already exchanged with the company. http://airconsumer.ost.dot.gov/