United Airlines faced further anger from passengers on Sunday after one of its planes suffered an engine fire on arrival at Denver International Airport.
Flight 5869, operated by SkyWest, was arriving from Aspen at around 2.20pm local time (9.20pm GMT) when the engine erupted in flames.
Pictures published on Twitter (below) show fire billowing from the engine at the back of the plane, and also licking the tarmac of the runway below.
The plane, carrying 65 passengers, and its crew were evacuated on the runway. No injuries were reported in the incident, with witnesses praising the emergency services for their rapid response.
Nonetheless the incident provides further unwelcome publicity for United Airlines after a spate of controversies this year.
The most high-profile incident, which saw passenger David Dao dragged off a United flight which was overbooked, was later described as a "mistake of epic proportions" by CEO Oscar Munoz and resulted in a huge compensation settlement for the victim.