Jet2 has ordered an extra 36 new Airbus A321 NEO aircraft to be delivered over five years up to 2028.
Also, it has options to increase the order to a total of 60 aircraft.
The airline said the list price for the 36 aircraft was almost $5bn, but it said it had negotiated ‘significant’ discounts.
Jet2 Chairman Philip Meeson said: “We are delighted to have placed this order with Airbus and are proud to operate this aircraft which has more seats, provides additional operating benefits through lower fuel consumption and is, in our opinion, the most efficient and environmentally friendly aircraft in its class today.”