• Operation Blue Skies will test AI-led contrail avoidance across Shanwick airspace, which accounts for about 5% of global contrail warming.
• Around 10,000 flights will cross the trial area during operating hours each year, with selected aircraft making small route adjustments.
• Google UK will contribute £1.4 million ($1.9 million) in AI expertise, engineering and computing infrastructure on a pro-bono basis.

Google UK and the UK Government are launching the world’s first state-backed trial to reduce aviation contrails across an entire oceanic airspace.

Operation Blue Skies will use artificial intelligence, satellite imagery and weather forecasting to identify areas where aircraft are likely to create strongly warming contrails. Air traffic controllers can then direct selected flights around those regions.

The 30-month programme moves contrail avoidance beyond individual airline trials and into coordinated airspace management. It will operate across the eastern half of the North Atlantic corridor in Shanwick airspace.

Contrails form when water vapour condenses around soot particles in aircraft exhaust. While often short-lived, persistent warming contrails account for roughly one-third of aviation’s total climate impact.

That makes them an increasingly important target as the sector searches for ways to cut its climate footprint while sustainable aviation fuel and new aircraft technologies scale.

From airline trials to airspace-scale action

Google has already tested AI-powered contrail forecasts with airlines and aviation organisations. Partners have included American Airlines, EUROCONTROL’s Maastricht Upper Area Control Centre and flight planning software provider FlightKeys.

Those trials tested whether flight crews and air traffic controllers could make targeted adjustments around contrail-sensitive areas without disrupting normal operations.

Operation Blue Skies will now examine whether the approach can work across a major international flight corridor.

Shanwick airspace accounts for approximately 5% of global contrail warming. The programme will include two operational trials lasting about four months each.

Around 10,000 flights originating from hundreds of cities will pass through the airspace during trial hours each year. Only a small percentage are expected to require adjustments.

Flights that would otherwise cross contrail-sensitive regions could be slightly deviated. The aim is to prevent the formation of strongly warming contrails while limiting additional fuel use and operational disruption.

UK consortium combines AI, aviation and climate science

The programme brings together Google UK, NATS, Contrails.org, Imperial College London, the University of Cambridge and the UK Met Office.

Google UK will develop AI models that predict and help avoid warming contrails. Machine learning and satellite imaging will also be used to track and verify the climate impact.

NATS will oversee airspace operations, air traffic control coordination, safety assessments and controller training. Contrails.org will lead forecast assessments and help design trial parameters.

Imperial College London and the University of Cambridge will independently evaluate trial outcomes and climate impacts. The Met Office will develop a new UK contrail forecasting capability and support meteorological accuracy.

The governance structure is significant because aviation authorities need credible evidence that contrail avoidance can work safely at scale. Independent assessment will also be important when determining whether the approach can support wider climate policy.

Government funding targets UK scientific capability

Operation Blue Skies is co-funded by industry partners and the UK Department for Transport through the Aerospace Technology Institute Programme.

Government grant funding will go entirely to academic, non-profit and aviation partners. Google UK will participate on a pro-bono basis.

The company is contributing £1.4 million ($1.9 million) in-kind through AI research expertise, engineering time and high-performance computing infrastructure.

For governments and aviation executives, the trial offers a relatively near-term climate intervention. Contrail avoidance does not require airlines to replace existing fleets or wait for alternative propulsion technologies to mature.

Research suggests it could also be among the more cost-effective options for reducing aviation’s climate impact.

The larger question is whether the model can move from controlled trials into routine international air traffic management. That will require reliable forecasts, clear operational standards and coordination between governments, airlines and air navigation providers.

If Operation Blue Skies can demonstrate measurable climate benefits without compromising safety or significantly increasing fuel consumption, it could provide a blueprint for other high-traffic corridors.

For an industry facing growing pressure to address emissions beyond carbon dioxide alone, the North Atlantic trial will test whether AI can turn an overlooked source of aviation warming into a manageable operational problem.