Asia : http://www.airasia.com, http://www.jetstar.com, http://www.flyscoot.com, http://www.tigerairways.com
Europe : http://www.jetairfly.com/en/, http://www.tuifly.com/en/, http://www.jet2.com/, http://www.ryanair.com/en
North & South America : http://www.airtran.com/, http://www.southwest.com/, http://www.westjet.com
Africa : http://www.kulula.com/, http://www.turkishairlines.com/, http://www.jet4you.com
I know these are just few of thousands avaliable out there, Hopefully many of you would add to the list.