easyJet study reveals airspace modernisation could save 18 million tonnes of CO2 a year from European aviation

• New analysis from easyJet has found that inefficient airspace contributes to significant and unnecessary increases in fuel consumption, CO₂ emissions and flight times across Europe.
• The airline used AI to analyse and model the carbon impact resulting from airspace inefficiencies across all easyJet flights over the past 12-months
• Results showed if airspace was modernised, easyJet alone could achieve over a 10% reduction in emissions through airspace modernisation. The countries with the greatest need for improvement are the United Kingdom, Italy, France, Spain, and Switzerland
• The modelling also showed that excess carbon is being released during all flight phases, with the descent phase particularly inefficient due to poorly designed lower airspace near airports
• easyJet is appealing for urgent reform to modernise airspace and harness these huge efficiency gains, which could contribute significantly to the industry’s decarbonisation targets

In an industry first, easyJet has calculated the impact inefficient airspace across Europe is having on CO₂ emissions, in a bid to finally evidence why reform is so badly needed and long overdue.
Using AI, the airline monitored every single one of its flights over a 12-month period* to understand how airspace inefficiency is impacting its operations and therefore the operations of airlines across Europe.

The results revealed that airspace inefficiencies increased CO₂ emissions by 10.62% – equivalent to 663,710 tonnes CO₂ – all because of the current airspace regime across Europe. 
Applying its analysis to the whole of European aviation, easyJet estimates that airspace modernisation could help eliminate 18 million tonnes of CO₂** from European skies every year, a figure that reveals the size of this opportunity – and one that could be a significant route to creating an immediate and meaningful carbon emissions reduction across European aviation.

The analysis, conducted by leading experts in easyJet’s Flight Efficiencies team, found that a significant proportion of this inefficiency occurs around terminal airspace, particularly during descent, which is largely due to outdated or poorly designed lower airspace.

While airspace inefficiency is a universal issue across the whole of Europe, the greatest inefficiencies for easyJet’s operations were in the UK – with 7 of the 10 least efficient routes occurring inbound into London Gatwick, with the South East of the UK a particular problem area due to high demand and capacity constraints.

However, with the UK having jurisdiction over its airspace, and the new Government having pledged in its manifesto to support the modernisation of UK airspace , there is hope that these changes are closer to being achieved than ever before and that the UK can become an international leader in driving airspace reform.
 
The countries with the greatest need for improvement are the United Kingdom, Italy, France, Spain, and Switzerland. For example, 19% excess emissions is typically produced on flights between London Gatwick and Malpensa.

The most inefficient route in each of these countries:

COUNTRIES / ROUTE

Spain/ UK - Palma de Mallorca to London Gatwick

Portugal/ UK - Faro to London Gatwick

UK/ Italy - London Gatwick to Malpensa

Portugal/ Switzerland Porto to Geneva

France / UK - Nice Côte d’Azur to London Gatwick 

Factors causing the greatest inefficiencies:
As part of this project, easyJet carried out a comprehensive evaluation of all airways*** utilised across its network, to pinpoint the areas of greatest inefficiency and where immediate reform is needed. The greatest inefficiencies include:

• Climb – The analysis identifies London Gatwick, Milan Malpensa, Geneva, Naples, and Paris Charles de Gaulle as having the most inefficient departures. To improve efficiency, airspace must be redesigned to support Continuous Climb Operations (CCO), enabling aircraft to reach cruising altitude more efficiently.
• Cruise – the upper airspaces over Italy, United Kingdom, France and Spain have been identified as some of the most problematic regions in Europe. These areas face significant inefficiencies due to outdated procedures, complex routing, and limited airspace flexibility. To improve efficiency in these upper airspaces, it’s crucial to expand Cross-Border Free Route Airspace (FRA) Operations to allow for more direct routing and reduce fuel consumption.
• Descent – Inefficiencies are particularly notable in the United Kingdom, Italy, Switzerland and France, where arrival procedures result in extended flight times and increased fuel consumption. Also notably, the recently redesigned arrivals in London the recently redesigned arrivals in London Luton (LTN) and Milan Malpensa (MXP) have proven to be less efficient than the previous procedures, adding an average of 10 minutes to planned flight times. These inefficiencies are often due to overly complex procedures that prioritise controller workload over operational efficiency. To improve descent inefficiencies, it is essential to redesign arrival procedures with a focus on reducing track miles, implementing Continuous Descent Approaches (CDAs) and minimising level-offs.

 How to solve the problem?
In the UK, we need to complete the airspace modernisation programme in the UK with a focus on the south east and ensuring that there is a single entity responsible for the timely delivery of the programme. Across Europe, easyJet plans to collaborate with individual countries, Air Navigation Service Providers (ANSPs) and airports to identify ways to solve these inefficiencies.
It’s essential we also deliver the quick wins, for example, implementing Free Route Airspace in the UK and France – the last countries to implement completely across their regions and which would drive immediate efficiency improvements.
To unlock the over 10% efficiency gain in airspace operations, easyJet’s model indicates we need to put in place structural changes that modernise outdated airspace and remove historic constraints. The quickest wins can be achieved by redesigning lower airspace procedures, such as Standard Terminal Arrival Routes (STARs) and Transitions, to better align with modern aircraft capabilities. Implementing Required Navigation Performance with Authorisation Required (RNP-AR) approaches at more airports will also bring significant improvements. These procedures, already successfully deployed in Scandinavia, offer highly predictable tracks that avoid overflying densely populated areas, reducing both noise pollution and environmental impact.
ANSPs should prioritise the implementation of ATS B2 Automatic Dependent Surveillance - Contract (ADS-C) to enable Trajectory-Based Operations (TBO) well before the 2027 mandate, to meet the growing demands for airspace efficiency, safety, and environmental sustainability. The Maastricht Upper Area Control Centre (MUAC) has already successfully implemented this technology since May 2022, demonstrating its effectiveness in optimising air traffic management.
 
Johan Lundgren, CEO of easyJet, said:  
“Airspace modernisation is the quickest and most cost-effective way to reduce carbon emissions, but the process is being shackled by needless bureaucracy.”
“Our data proves that the airspace corridors we use today, which were built in the 1950s, are simply no longer fit for purpose. Adapting them to be more efficient would not only be significant in terms of CO₂ reduction but for journey times and improving the experience of passengers.
“This can can’t be kicked down the road any further. If we’re serious about achieving net-zero, policymakers and regulators need to come together to find a route to unlock these significant gains, and now.”

Aviation Minister Mike Kane said:
“The aviation industry is set to undergo a green revolution, with airspace reform playing a crucial role.
“easyJet’”s modelling shows how a modernised airspace system will help ease delays, support decarbonisation and reduce noise – all supporting this Government’s plan to boost economic growth.”
 
Notes to editors:
 
*Fight data take between June 2023 to July 2024.
 
**Calculations based on the total gate-to-gate CO₂ emissions within the EUROCONTROL area in 2023 were 180.2 million tonnes.
 
***including Standard Instrument Departure (SID) Direct Segment (DCT), and Standard Terminal Arrival Route (STAR),
 
About easyJet
easyJet is Europe’s leading airline offering a unique and winning combination of the best route network connecting Europe’s primary airports with great value fares and friendly service.

easyJet flies on more of Europe’s most popular routes than any other airline and carried more than 82 million passengers in 2023 with more than 11.3 million travelling for business. The airline has over 300 aircraft flying on nearly 1000 routes to more than 155 airports across 35 countries. Over 300 million Europeans live within one hour’s drive of an easyJet airport.

easyJet aims to be a good corporate citizen, employing people on local contracts in eight countries across Europe in full compliance with national laws and recognizing their trade unions. The airline supports several local charities and has a corporate partnership with UNICEF which has raised nearly £17m for the most vulnerable children since it was established in 2012.

In 2022, easyJet published its roadmap to net zero by 2050. The roadmap, which also features a combination of fleet renewal, operational efficiencies, airspace modernization, Sustainable Aviation Fuel and carbon removal technology, has set an ambitious interim carbon emissions intensity reduction target of 35% by 2035. The airline’s ultimate aim is to fully transition its fleet to zero carbon emission technology, which it will achieve through a number of strategic partnerships including with Airbus, Rolls-Royce, and GKN Aerospace Solutions. Since 2000, the airline has successfully reduced its carbon emissions per passenger, per kilometer by one-third. 

Innovation is in easyJet’s DNA – since launching nearly 30 years ago, easyJet changed the way people fly to the present day where the airline leads the industry in digital and operational innovations to make travel easier and more affordable for its passengers.

In 2023 easyJet was named by TIME as one of the World’s Best Companies and a Leader in Diversity 2024 by The Financial Times