Only YOUR CUSTOMERS can confirm the adequacy of what standards they expect their supply chain to be certified to, but, since the early 2000's, the Aviation, Space & Defense Sector have been converging towards the IAQG family of standards to enhance confidence in the supply chain. Chances are, you would need AS9100 and AS9110, but some MRO's have been certified also to 9100.
PS. As always, the quality of the answers depend on the clarity and completeness/contextualization of the questions.