The flight took off from nearby Colorado Springs and was on the way to Dallas Fort Worth International Airport in Texas, the FAA said in a statement to the BBC.
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The plane diverted to Denver around 17:15 pm local time (23:15 GMT) after the crew reported “engine vibrations,” the FAA said.
After the flight landed, it caught fire while taxiing on the tarmac at the airport.
American Airlines said the plane had 172 passengers on board, along with six crew members. All were evacuated safely, the company said.
It said the plane was a Boeing 737-800 and experienced an “engine-related issue”.
Smoke and flames were visible from various gates at the airport, according to airport spokesman Michael Konopasek. He said the fire was doused and it did not lead to delays for other flights.
Some of those inside the airport posted videos on social media showing the plane’s passengers walking toward the edge of the wing as large clouds of black smoke filled the air.
Grounds crew can be seen rushing to the wing while pushing ladders.
Video showed active flames under the plane’s right engine as an inflatable evacuation slide appeared at the aircraft’s rear door.
The incident comes after a recent string of high-profile accidents in North America have raised concerns about aviation safety.
A fatal crash in Washington DC left 67 people dead when an American Airlines regional jet collided mid-air with a US Army Black Hawk helicopter. The crash in the US capital city led to questions about air traffic controller shortages and their workloads.
US President Donald Trump’s administration has also terminated hundreds of FAA probationary workers as part of government cost-saving efforts.
The layoffs happened weeks after the fatal DC crash.
The laid off FAA employees included maintenance mechanics, environmental compliance workers and technical assistants.
Trump has pushed to reduce government spending with tech billionaire Elon Musk spearheading efforts as part of the Department of Government Efficiency (DOGE).
