Definition
An FAA field office responsible for the certification, inspection, and ongoing oversight of air carrier operators within a defined geographic region. ACDOs handle regulatory matters specific to commercial air carriers, including operating certificates, training program approvals, and compliance inspections.
Plain English
A local FAA office that watches over airline and commercial passenger or cargo operators in its area, making sure they meet the rules for safe commercial flying.
Context Anchor
You may see ACDO in FAA publications, company manuals, or paperwork related to airline, commuter, or other air carrier operations.
Derivation
"Air carrier" refers to a company that carries passengers or cargo for hire by air. "District office" means a regional FAA office covering a specific geographic area. Together: the regional FAA office that oversees air carriers.
Why Pilots Care
Pilots flying for an airline or commercial operator will see their company interact with an ACDO (or its modern equivalent) on certification, training, and inspection matters. Knowing what the office does helps pilots understand where company procedures and approvals come from.
Intuition Check
Do not read ACDO as an airport customer-service office or an airline office. It is an FAA oversight office for air carrier operations.
Example Sentence 1
The carrier submitted its revised training program to the ACDO for review.
Example Sentence 2
Pilots at a new air carrier may have their training programs reviewed by the ACDO before operations begin.