The order, which first appeared as unidentified on Boeing’s Orders & Deliveries website in June, includes 60 Boeing 737-10s with options for 25 more, as well as seven 787-9 Dreamliners with options for four additional aircraft.

“With the addition of these aircraft, WestJet has the largest order book of any airline in Canada, and will double our fleet of Dreamliners, underpinning our growth plans and our commitment to affordable travel options for Canadians and exciting career paths for our people,” said Alexis von Hoensbroech, WestJet chief executive officer. “These highly efficient and comfortable aircraft are critical to the growth and renewal of our fleet and will also significantly improve our fuel consumption.”

Founded in 1996 with just three Boeing 737s, WestJet now operates nearly 150 of the type, connecting Canadians with domestic and international destinations. The airline’s fleet includes both the 787 Dreamliner and 737 MAX families, used on long-haul services to Europe, Asia and Latin America.

This new order will double WestJet’s 787-9 fleet to 14 aircraft and increase its 737-10 commitments to 107. The commonality of the 737-10 fleet will enable the carrier to serve more passengers at the lowest cost per seat of any single-aisle jet, while the 787 Dreamliner brings efficiency and enhanced passenger comfort.

“We are honoured that WestJet has once again placed its trust in Boeing with a major investment that builds on our three decades of partnership and solidifies their fleet for the decades ahead,” said Stephanie Pope, president and CEO of Boeing Commercial Airplanes. “We look forward to supporting WestJet’s exciting growth as they leverage the 737 MAX and 787 Dreamliner to serve even more passengers with great efficiency and comfort.”

WestJet’s fleet is among the youngest of established North American carriers, with an average age of approximately 10 years.