Consolidated Travel Group - http://www.consolidatedtravel.com.au/
The latest and most comprehensive airfares database for travel agents.
Insanelycheapflights.com - http://insanelycheapflights.com/Airlines/Frontier-Airlines.aspx
Book cheap flights in North America. Save on travel to California, Florida and Mexico, plus great travel deals to cities in Canada. Save on flights, hotel rooms and car rentals.
Travel HUB - http://travelhub.com/
Brings you the latest vacation package deals, cheap airline tickets and great deals on cruises from over 800 certified specialty travel agencies.
Wide range of Cheap Holidays - http://www.flysearch.co.uk/
Fly Search offer a choice of cheap holiday deals on all inclusive holidays and package holidays to a wide range of destinations.