Booking.com has quietly started testing partnerships for other travel products, including package trips via a deal with Lastminute.com.
European users can reach the package search and booking platform via the top navigation of the accommodation site, where they are directed to a co-branded Booking.com-Lastminute.com flight+hotel package microsite.
Other new options include rail, which is essentially just an affiliate link to multi-modal travel search engine GoEuro.
Subscribe to our newsletter below
A similar navigation option sends users to the Costa Cruises website for "Cruises".
Existing links to Flights via sister brand Kayak and Car Hire to RentalCars remain in the navigation.
Airport Taxis are available via another brand in the Priceline Group family, RideWays, as well as OpenTable for restaurants.
U.S. users have packages powered by Priceline.com and an option for Buses, also on an affiliate link to GuEuro.
The Priceline Group says the testing is to "gauge consumer appetite on the platform".
In some respects, adding such tools in the navigation and not included in pushy reminders during the booking flow may not be that effective, at least in terms of a high-profile broadening of the brand's offering.
But the tests (flights, restaurants and car hire were added in the summer of 2017) are clearly part of a wider strategy to offer more to users on one of the biggest travel websites on the planet - a move which by default would create some modest traffic to partners such as Lastminute.com.
The tests, in various forms, can be found in a number of countries including Germany, U.K. and the U.S.