English: AOC
Welsh: AOC
Subject: Trafnidiaeth
Welsh definition: An air operator's certificate (AOC) is the approval granted by a national aviation authority to an aircraft operator to allow it to use aircraft for commercial purposes.
Notes: Dyma’r acronym a ddefnyddir yn y ddwy iaith ar gyfer Air Operator’s Certificate / Tystysgrif Gweithredwr Awyr.