1. Air Transport Association, 2003a. Airlines in Crisis: the Perfect Economic Storm. ATA, Washington, DC.
2. Air Transport Association, 2003b. Airport and Airway Trust Fund: cash flow and balance, 1971–present. Retrieved December 20, 2003 from http://www.air-transport.org/econ/files/trustfund.pdf.
3. Air Transport Association, 2003c. Domestic ticket taxes. Retrieved December 20, 2003 from http://www.airlines.org/econ/d.aspx?nid=5382.
4. Air Transport Association, 2003d. Passenger facility charges. Retrieved December 21, 2003 from http://www.airlines.org/econ/d.aspx?nid=1277.
5. Air Transport Association, 2003e. US (or US-approved) Aviation excise taxes and user fees. Retrieved December 21, 2003 from http://www.airlines.org/econ/d.aspx?nid=4919.