Jet2 is expected to complete the Winglet Modification program for the Boeing 737-800 fleet this summer.
The UK leisure carrier has 93 737-800s, remodeling dozens of them with split simital wing plates to improve fuel efficiency.
It said 60% of aircraft undergoing modifications have been changed so far, and plans to complete the program this summer.
This measure is part of an effort to reduce carbon emissions strength.
JET2 modernized its fleet with the introduction of the Airbus A321neos, six of which retired in January and eventually retired in the 737s.
This summer, the 23 A321neos are part of a fleet of 135 aircraft, aiming to rise from last year's 126 levels.
The A321neos is part of a commitment to 146 ownership and nine lease examples of Twinjet type, whose delivery will take place in 2035.
In its newly released full-year financial briefing, Carrier says it is cutting unit emissions from its past 66.4g to 65.7g of carbon dioxide, aiming for a 43.55g 2035 target.
JET2 rose £593 million ($866 million) pre-tax profit by 12% in the 12 months ended March 31, bringing group revenues up 15% to about £7.2 billion.
Chief Executive Steve Heapy says the airline has “successfully adapted” to the “growth trend” of passenger bookings near the departure date.
Jet2 sales capacity for summer 2025 is 8% higher than last summer levels. The company said it is “trading in line with market expectations,” and although its full year forecasts are premature, it says it is “satisfied” with progress in the 2025-26 fiscal year.
