Amazon says its Prime Air drone delivery service is the first operator in the world to receive a SAIL 4 Operating Authorisation and SAIL 4 Flightworthiness Validation from the UK Civil Aviation Authority. The company announced the approval on November 10.
SAIL, short for Specific Assurance and Integrity Level, is the risk-scoring scale used under the UK’s SORA process for advanced drone operations. Level 4 is treated as a medium-to-high-risk tier where the CAA expects significant technical and organisational safety assurance.
More customers in Darlington
Prime Air has flown beyond visual line of sight around Darlington since early 2026, but only over less densely populated areas. Amazon says the new approval allows flights over more of the area, growing the pool of eligible customers from about 600 to roughly 8,000. Deliveries use the MK30 drone and are promised in under two hours.
The service covers homes with a garden or driveway within 7.5 miles (12 km) of the Darlington fulfilment centre, for items up to 5 lb (2.2 kg) that fit in a large shoebox.
Amazon highlighted the MK30’s detect-and-avoid system, an independent monitoring computer that can hand control to a backup system, and redundancy that includes six motors and a three-cell battery.
Theunis Scheepers, director of Prime Air Europe, said earning the approval took years of engineering work and called it the foundation for bringing the service to more of the UK. Sophie O’Sullivan, the CAA’s director of future safety and innovation, said the authorisation was a step toward safely integrating new technologies into UK airspace.
Source: Amazon.