Amazon has expanded its Prime Air drone delivery service to about 8,000 households in the Darlington area after securing what it described as the “world’s first” Sail 4 safety authorisation from the Civil Aviation Authority. The wider service went live yesterday.

The service had previously been available to about 600 customers after a pilot launched earlier this year, Prime Air’s first expansion outside the US.

Amazon said it had secured a Sail 4 (Specific Assurance and Integrity Level 4) operating authorisation and flightworthiness validation from the CAA. The approval means its drones can fly further and across urban areas, and lays the foundation for future expansion across the UK.

Sail levels are part of UK SORA, the risk assessment method the CAA has used since 23 April 2025 to grant operational authorisations for drone flights in the so-called specific category. In its announcement of the Sail 4 approval, Amazon described the level as medium to high risk, the point at which the CAA expects significant technical and organisational safety assurance.

According to Amazon, the CAA assessed Prime Air’s operation, aircraft, organisation and approach to risk before concluding that it met the Sail 4 standard. Amazon said the CAA is the first regulator in the world to assess and approve an operation at that level.

The Darlington service had been operating under a different CAA authorisation for flights in less densely populated areas.

Theunis Scheepers, Amazon’s director for Prime Air in Europe, said it was the “world’s first Sail 4 approval from the UK CAA, a standard that sets a new benchmark for safety in drone aviation”.

He added: “From day one we worked backwards from the most demanding standards, and earning this took years of disciplined engineering and an unwavering commitment to safety.

“This is the foundation for the future of delivery, and for customers it means getting the things they need quickly, safely and reliably. This is just the beginning for Prime Air in the UK.”

Customers can order a range of everyday items for delivery to their door. Amazon’s own announcement says deliveries arrive in under two hours.

Drone delivery is included in Amazon Prime membership with no additional delivery fee, and customers can see which items are eligible as they shop and at checkout. In the US, non-Prime members are charged an additional $4.99 and there is a surcharge on small orders.

As part of the limited launch in Darlington, Prime Air has been available to customers with a garden, yard or driveway, for items that weigh less than 5lb and fit into a large shoebox. Business Matters reported on the limited launch in May. Prime Air’s website says Prime Air has already made “hundreds of thousands of drone deliveries” in the US.

Its electric MK30 drone uses machine-learning models to recognise other aircraft, people, animals and obstacles throughout each flight. As it descends to deliver, its systems identify and avoid hazards such as clothes lines and trampolines that would not appear on a satellite map.

Research from Challenge Works, a social enterprise, found that the use of drones in cities “entails greater use of low-altitude airspace … creating issues around how this airspace is managed”. Prime Air already operates in US cities with high-rise buildings, including Houston, Chicago and Detroit.

Some Darlington residents have been pleased by the speed of delivery, but others are not convinced, the BBC reported. Residents said they would miss the physical contact of a regular delivery and the reassurance of being handed a parcel rather than having it dropped into their garden.

When trials began in January, residents raised concerns about lost or broken parcels, privacy and job losses, the Darlington & Stockton Times reported.

Other drone delivery services have been tested in the UK, where officials have been preparing rules for drones to fly beyond a pilot’s line of sight. Royal Mail has used drones to deliver to the Orkney Islands, and the NHS has launched a drone medical delivery service, Apian. In 2024, Guy’s and St Thomas’ NHS Foundation Trust in London announced that urgent blood samples would start to be transported by drone.

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