• Certification Branches – formerly Aircraft Certification Offices (ACO)
• Certificate Management (CM) Branches – formerly Manufacturing Inspection Offices (MIO)
• Certificate Management (CM) Sections – formerly Manufacturing Inspection District Offices (MIDO)
• Flight Standards District Offices (FSDO)
• International Field Offices (IFO)
• Certificate Management Offices (CMO)
• Air Traffic Safety Oversight Service (AOV)

Which local office should I contact?