The move means that air traffic control communications will now refer to all American and US Airways flights with the single call sign, “American”.
The new certificate comes 16 months after the merger between the two airlines was finalised.
“Achieving a single operating certificate is an important step toward becoming a fully integrated airline,” said Robert Isom, American’s chief operating officer.
“As a global airline, this work spanned many regions. We thank the Department of Transportation and regulatory authorities in more than 50 countries who worked alongside us to ensure this critical project remained on track.
“While today marks a significant milestone for our integration, there is still much that remains ahead and we will intensify our focus on moving to a single reservations system and website and combining our frontline employee workgroups.”
American stressed that the FAA’s recognition of American as a single operator “does not mean change for customers”, who will still be able to check in for their flights on usairways.com, or at US Airways ticket counters. But American will move to a single reservations system later this year.
The merger of American and US Airways has created the world’s biggest airline, carrying 197 million passengers and generating almost US$43 billion in revenues in 2014.