Amazon says its Prime Air drone delivery service has become the first operator in the world to receive both a Specific Assurance and Integrity Level (SAIL) 4 Operating Authorisation and SAIL 4 Flightworthiness Validation from the UK Civil Aviation Authority (CAA), enabling it to expand operations into more densely populated areas around Darlington.
Announced on 10 November, the approval follows a safety assessment of Prime Air’s operation, aircraft, organisation and risk management processes. Amazon said the authorisation will increase the number of eligible households in the Darlington area from approximately 600 to 8,000, with deliveries available in under two hours.
Prime Air has operated in Darlington since early 2026 under CAA authorisation for beyond-visual-line-of-sight (BVLOS) flights in less densely populated areas. The new approval allows the service to operate across a wider area and provides a basis for potential expansion elsewhere in the UK.
The approval covers the MK30 delivery drone, which uses an onboard detect-and-avoid system based on machine-learning models to monitor surrounding airspace and identify aircraft, people, animals and obstacles. The aircraft also includes redundant flight-control systems, six motors and a three-cell battery. According to Amazon, these features formed part of the safety case assessed by the CAA.
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https://www.aboutamazon.co.uk/news/innovation/prime-air-secures-sail-4-approval-uk-civil-aviation-authority