The announcement represents one of the most significant strategic changes made by the airline since it introduced allocated seating in 2012.
Bookings will include the GatwickConnects service, meaning passengers’ checked luggage will be transferred to their second flight, and if they miss their connection they will be given a seat on the next available flight free of charge.
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The increased connectivity is due to an “innovative platform” created by flight search engine firm Dohop.
The airline will also begin selling standalone tickets on behalf of Loganair from next month, allowing easyJet customers to book onward flights from destinations such as Glasgow and Edinburgh to Scotland’s Highlands and Islands.
EasyJet’s outgoing chief executive Dame Carolyn McCall said: “Around 70 million passengers flying through an easyJet airport each year are connecting on to other flights, mainly long-haul, and it is this market segment that Worldwide by easyJet will open up for us.
“Because of easyJet’s strong positions at Europe’s leading airports and our customer focus, long-haul carriers have been asking to work with easyJet for some time and the new technology platform has now allowed us to do so.
“Our own customers and those who fly with other airlines, short and long-haul, have also asked us to make it easier to connect with easyJet flights and this simple booking platform makes it easy for them to do so.
Thomas Ramdahl, chief commercial officer of Norwegian, said: “Travel should be affordable for all so we are delighted to partner with another quality low-cost airline like easyJet to offer passengers even more choice.
“With Norwegian’s growing long-haul networks and easyJet’s extensive European routes, millions more passengers will have the chance to travel to some of the world’s top destinations, all with great fares, smooth connections and a quality service.”
Ed Sims, an executive vice-president at WestJet, said: “EasyJet’s new booking platform, Worldwide, is a great fit with our London Gatwick service and we’re excited to provide Canadian travellers with connections to easyJet’s extensive European network.