NATS and Leidos mark 10 years of TBS

Above: TBS was based on a collaboration by NATS, Leidos and Think Research.
Courtesy NATS

Since its introduction, this pioneering technology has redefined approach operations, delivering remarkable environmental benefits and operational efficiencies that have set a new standard for the aviation industry.

TBS dynamically adjusts the spacing between arriving aircraft based on time rather than distance. This intelligent approach has been instrumental in reducing the need for extended airborne holding, saving fuel and cutting carbon emissions and improving on time performance.

Since its introduction for Heathrow in 2015, TBS has achieved remarkable results, cutting headwind delays by 62%, reducing airborne holding by 1,500,000 minutes – the equivalent of almost three years of holding time – and saving over 100,000 tonnes of fuel, worth approximately $70 million based on current jet fuel prices. Additionally, TBS has saved over 300,000 tonnes of CO2 emissions, contributing to a more sustainable aviation industry.

The success of TBS is a testament to the power of collaboration between industry leaders. Originally developed and delivered by NATS and Leidos for Heathrow Airport, the technology has set a benchmark for airport arrivals management worldwide, inspiring the adoption at other major airports across the globe as part of the Intelligent Approach toolset.

Chris Norsworthy, NATS Director Airspace and Future Operations, said: “Time Based Separation is a great example of how technology can transform air traffic management. By working closely with Heathrow and Leidos, we pioneered and delivered a solution that benefits passengers, airlines, and the environment. We’re incredibly proud of what we’ve achieved together.”

Beyond its environmental benefits, TBS has delivered substantial economic savings. By reducing the time aircraft spend holding, TBS has delivered cost savings for airlines. Based on an estimate of €100 per minute for the operational costs associated with extended flight times – as per a 2015 Eurocontrol study – airlines have saved an estimated €184 million since TBS was introduced.

Dale Reeson, Heathrow Director of Airside and Airspace Operations, said: “Time-Based Separation has been a game-changer for Heathrow. For airlines, it has unlocked major efficiencies, cutting fuel consumption and costs. For passengers, it has meant smoother, more reliable journeys. And for us, it has enabled Heathrow to be more resilient while reducing our environmental impact. TBS is a perfect example of how innovation can deliver benefits for everyone.”

The success of TBS as part of Intelligent Approach demonstrates the potential for advanced air traffic management solutions to deliver significant benefits for the aviation industry and the environment. As the industry continues to evolve, NATS and Leidos remain committed to driving innovation and enhancing the efficiency and sustainability of air travel.

Research on Time Based Separation was carried out by NATS as part of the SESAR Programme.