Aircraft leasing & safety oversight

How is safety oversight ensured in case of aircraft leasing? We’ll look at the role of leasing in the growth of Africa’s aviation industry. An important focus point is maintaining airworthiness of an aircraft. How is the airworthiness ensured? What role do the aircraft leasing company and the user have in implementing airworthiness directives (ADs) and Service Bulletins (SBs), with ADs being legally required and implementation of SBs being best practice.