"ATA to buy World Air, North American Air." Pacific Business News. Thursday April 5, 2007. Last modified on Friday April 6, 2007. 1Archived 2012-11-03 at the Wayback Machine. Retrieved on September 12, 2011.
"ATA to buy World Air, North American Air." Pacific Business News. Thursday April 5, 2007. Last modified on Friday April 6, 2007. 1Archived 2012-11-03 at the Wayback Machine. Retrieved on September 12, 2011.