7th September 2026 – (Hong Kong) Cathay Pacific and Google have announced their collaboration on an ambitious project to advance research into contrails and their implications for aviation’s climate footprint. This partnership marks Cathay Pacific as Google’s inaugural commercial airline partner in Asia-Pacific for AI-driven contrail mitigation technology, and notably, the first airline worldwide to explore contrail avoidance on ultra-long-haul services. The trials, already underway across Cathay Pacific’s extensive global network, seek to evaluate both the practical viability and operational limitations associated with mitigating contrails generated by aircraft.
Contrails, or condensation trails, appear as thin white lines behind aircraft and are formed when aeroplanes pass through cold, humid conditions at high altitude. While some contrails dissipate quickly, others persist and spread, resulting in larger cloud formations which can trap heat within the earth’s atmosphere. Scientific studies indicate that these long-lasting contrails could account for approximately one-third of aviation’s total climate impact, underscoring the importance of understanding and reducing their occurrence in addition to tackling carbon dioxide emissions.
Cathay Pacific has long recognised the airline industry’s environmental responsibilities, with an ongoing focus on minimising carbon dioxide emissions through fleet modernisation, operational enhancements, and the adoption of sustainable aviation fuel. However, the airline also acknowledges the significance of non-carbon climate effects, such as those produced by contrails. Working with Google, Cathay Pacific is supplying valuable operational data through flight trials, furthering global research into contrail formation and avoidance. These efforts are expected to yield new insights regarding the potential climate benefits of contrail mitigation across real-world flight conditions, particularly in regions such as Asia-Pacific which have been underrepresented in previous studies.
Google’s solution integrates artificial intelligence-based predictive models, satellite imagery, and sophisticated weather analysis to anticipate when and where contrails are most likely to form. This data enables both flight dispatchers and pilots to make considered altitude adjustments, similar to standard procedures for evading turbulence. Cathay Pacific’s pilots, utilising the company’s modern fleet with advanced connectivity and its proprietary Electronic Flight Folder system, can access live Google contrail forecasts alongside key operational information, promoting timely and seamless decision-making in the cockpit.
Since late 2025, the ongoing operational trial has targeted more than one hundred flights across Cathay Pacific’s network. Over eighty of these journeys were routed to avoid predicted contrail zones, with Google estimating that these efforts have resulted in approximately a forty per cent reduction in the warming effect caused by contrails.