Jet2 is expecting to complete a winglet modification programme for its Boeing 737-800 fleet this summer.
The UK leisure carrier has 93 737-800s and is retrofitting dozens of them with split-scimitar winglets to improve fuel efficiency.
It states that 60% of the aircraft undergoing retrofit have been modified so far, and it expects to complete the programme in summer this year.
The measures are part of its effort to reduce carbon-emission intensity.
Jet2 is modernising its fleet with the introduction of Airbus A321neos, replacing its older Boeing 757-200s – the last six of which were retired in January – and, eventually, its 737s.
It aims to have 23 A321neos this summer, part of an overall fleet of 135 aircraft – up from last year’s level of 126.
The A321neos are part of a commitment to 146 owned and nine leased examples of the twinjet type, deliveries of which run to 2035.
The carrier says, in its newly-released full-year financial briefing, that it has reduced its unit emissions figure to 65.7g of carbon dioxide from the previous 66.4g, and is aiming for a 2035 target of 43.55g.
Jet2 turned in a pre-tax profit of £593 million ($806 million) in the 12 months to 31 March, up by 12%, on a 15% rise in group revenues to nearly £7.2 billion.
Chief executive Steve Heapy says the airline has “successfully adapted” to the “growing trend” of passengers’ booking closer to departure dates.
Jet2’s on-sale seat capacity for summer 2025 is 8% higher than the level of last summer. The company says it is “trading in line with market expectations” and – while a full-year forecast would be premature – it is “satisfied” with progress for fiscal 2025-26.
