"World Airline Directory." Flight International. March 30, 1985. 98Archived February 23, 2013, at the Wayback Machine. "Head Office: PO Box 949, Quad City Airport, Moline, Illinois 61265, USA."
naco.org
"Find a County". National Association of Counties. Archived from the original on May 31, 2011. Retrieved June 7, 2011.
"World Airline Directory." Flight International. March 30, 1985. 98Archived February 23, 2013, at the Wayback Machine. "Head Office: PO Box 949, Quad City Airport, Moline, Illinois 61265, USA."