Following an inspection in April 2016, on 10 May, UK-based Air Safety Support International (ASSI), a subsidiary company of the Civil Aviation Authority responsible for aviation safety in Overseas Territories, issued an Aerodrome Certificate to St Helena Airport. This safety certificate indicated that airport infrastructure, aviation security measures and air traffic control service complied with international aviation safety and security standards. ASSI did not allow the airport to go into commercial operation, however, due to concerns over operational readiness of monitoring and clearing issues that include wind shear and turbulence.