Sunwing and iTravel2000 are the two local travel brands to lose out as Hotwire and CheapoAir move into fourth and third places respectively in Canada.
Priceline is slowly creeping up behind rival online agency brand Expedia in the list of leading travel websites in the US during May 2013.
Former Expedia CEO Erik Blachford is one of a number of big names putting some angel investment into tours and activities service TourRadar.
Jeffery Boyd, CEO of Priceline, recently made comments casting doubt on the effectiveness of relative newbies Room77 and HotelTonight.
Expedia may have retained its lead at the top of the leading travel sites in New Zealand, but Wotif has long its second spot to Webjet.
The gap between EasyJet and Ryanair has narrowed at the top of leading airline websites in the UK, but the pair have also stretched their respective leads over British Airways.