Booking.com is a rare entity in that it has secured an extension with Ryanair to continue providing accommodation to the carrier's website.
The white label deal was first signed in 2009 after a period of years when a number of third party hotel content suppliers came and went at Ryanair.
The most high profile of which was Expedia, which eventually ended up in the courts with the low cost carrier in a row over payments (the online travel agency lost).
The airlines says the full 550,000+ inventory of hotels, vacation rentals and other types of accommodation will be made available through the Ryanair Hotels platform.
Interestingly, accommodation in countries that Ryanair does not fly to (basically everything outside Europe) are included in the service.
Meanwhile, Booking.com has also secured a similar deal to provide rival carrier Germanwings with the same functionality.
Again, all 550,000+ properties on the Booking.com system are included in the package for the German low cost carrier.
Skyscanner recently talked up its growing B2B division, a move which has seen it secure the likes of Lonely Planet.
But it appears rival search engine Dohop, which has been working behind the scenes for a number of years to provide white label versions of its technology to third parties, is also seeing significant growth.
The company says it is now powering more than 2,000 travel sites globally, including Milan Malpensa Airport, ArrivalGuides and JetAirFly.
Dohop CEO Kristjan Bjarnason says the affiliate division within the business has "surpassed even the most optimistic of our projections".
"In fact, what was supposed to be a side-project has now grown into a separate division of the company, with dedicated project managers and developers."