Days after an older Boeing 737 engine caught on fire, there's still few answers about what led to the sparks. But aviation experts are keyed in to reports of "engine vibrations."

Footage filmed March 13 shows passengers evacuating after an American Airlines plane caught fire at Denver International Airport.

According to the Denver International Airport, no injuries were reported from a fire on an American Airlines plane that produced smoke visible to people inside the airport.

Travelers weighed in on air safety after an American Airlines plane diverted mid-flight and landed at Denver International Airport, sending passengers fleeing onto a wing in a fraught evacuation amid billowing clouds of smoke.