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Mon, 1 November 2021

Etihad Airways' Most Sustainable Flight Uses Contrail-Avoidance to Reduce Emissions

(01 Nov 2021) Etihad Airways operated its most sustainable flight ever on 23 October, leveraging the efficiencies developed over the last two years of its comprehensive sustainability programme to reduce carbon emissions (CO2) by 72% in absolute terms, compared to the equivalent flight operated in 2019.

The London Heathrow to Abu Dhabi flight is part of the Etihad Greenliner Programme a two-year partnership between Etihad and Boeing using Etihads Boeing 787 fleet as a test bed for sustainability improvements in partnership with organisations across the industry.

The flight required coordination with airspace management for optimised flight routing, new technology flight deck tools, sustainable aviation fuel (SAF), contrail reduction and airport handling processes.

Contrails (condensation trails) may account for more than half (57%) of the entire climate impact of aviation. Picture by Steven Howard of TravelNewsAsia.com Click to enlarge.

In an industry-first, EY20 was the first commercial flight to explore contrail-avoidance. Working with UK-based SATAVIA, the team identified potential areas of ice super-saturated regions in the atmosphere where harmful contrails are likely to form, and the flight route was adjusted to avoid those areas.

Based on the original and adjusted flight plan, the strategy avoided the production of approximately 64 tonnes of CO2e, with a fuel penalty of only 100kg, or 0.48 tonnes CO2.

These are noteworthy savings, said Mohammad Al Bulooki, Chief Operating Officer, Etihad Aviation Group. When Etihad committed to achieve net zero, it was acknowledged that it was only possible if the airline worked collaboratively and positively with our industry partners. That is exactly what Etihad has done with the Sustainable Flight. Of equal importance, Etihad, Boeing and its partners airports, ANSP, and suppliers used the flight to learn where further improvements could be made.

The contributions covered three phases, planning, in-flight and post-flight. This included preparing the aircraft, engines and route planning systems to optimise take-off, en-route and landing flight paths and trajectories, minimising contrail formation, working with our guests to reduce their luggage and rewarding those that travelled light.

Etihad provided catering that was appropriately sourced and served on sustainable crockery and with light-weight cutlery. The crockery itself is part of a circular recycling process where they are returned to the manufacturer at the end of their serviceable life and ground down to its raw material and remade. Guests were also provided with environmentally friendly plant-based water bottles and limited-edition tote bags from upcycled aircraft materials. 80% of all single use plastics were eliminated.

Once the aircraft arrived in Abu Dhabi, it was serviced by Etihads new fleet of electric vehicles for ground logistics such as baggage unloading. Where electric vehicles were unable to be used, Etihad purchased bio-diesel to fuel equipment such as the airlines passenger coach service between Abu Dhabi and Dubai, meaning all passengers, including those transiting to Dubai, were completely carbon neutral for the entirety of their journey.

The data gathered from the aircrafts sensors was added to Etihads growing database on flight performance, and analysed using tools from Greenliner partner, GE Digital to improve understanding of flight performance and allow quick recognition of unsustainable activities.

A fundamental part of the Greenliner programme is to explore the art of the possible. It is well known that SAFs are a credible alternative to current fossil fuels, however they are currently very expensive, and difficult to source and load onto the aircraft. EY20 was a dramatic example of those constraints wherein Etihad was unable to directly load the 38% SAF blend into the aircraft given inherent infrastructure constraints at Heathrow Airport. Instead, the SAF purchased by Etihad was loaded into the fuel hydrant system, which serves all airport users. While the EY20 did not in itself realise the full potential of the SAF, the potential benefit in CO2 reductions is real. Industry and governments must work together to address these issues through the funding of the research and development of SAFs and other parts of the planning and operating of flights. Etihad is looking forward to working on these issues, Al Bulooki said.

Tony Douglas, Group Chief Executive Officer, Etihad Aviation Group, said, The entire emissions reduction we achieved on this flight was through the operational steps and efficiencies employed and did not rely on off-sets. Nonetheless, off-sets, if done rigorously, also play a part in our sustainable future. The UAE has a large stock of mangroves which present nature-based solutions. In addition to their ability to reduce pollution from water and the atmosphere, if maintained properly, mangrove forests have the potential to avoid the release of CO2 into the atmosphere. That is why each guest on board this Etihad flight will have a tree adopted for them in Abu Dhabis Jubail Island Mangroves plantations. Adoption involves the maintenance and reforestation of existing forests with carbon storage potential. This is an important initiative for greening the UAE.

I want to pay particular tribute to our partners; Boeing, NATS, Eurocontrol, GE Aviation, Vitol, SATAVIA, deSter, Sola The Netherlands, ButterflyCup, Agthia, Jubail Island Mangroves and DNata Catering. This is only possible when we all work together, and we all commit to making whatever savings we can.

See also: The contribution of global aviation to anthropogenic climate forcing for 2000 to 2018.

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