Aviation authority chiefs have launched an investigation after airline passengers performed their version of the Harlem Shake dance craze during a flight.
A group of students are thought to have initiated the stunt during the journey from Colorado Springs to San Diego.
Footage of the antic uploaded to the internet shows one person starting the dancing before the video cuts to a large group of people showing off their moves, many in costume.
Those taking part include a man dressed in a banana outfit and another in an Abraham Lincoln mask alongside passengers, young and old, who appear to have joined in.
Second-year student Matt Zelin told the Colorado College newspaper, The Catalyst, he had asked a flight attendant for permission beforehand.
Federal Aviation Administration spokesman Allen Kenitzer said they were looking at what phase the flight was in during the dance in the aisles.
Frontier Airlines said the seatbelt sign was off and safety measures were followed.
The Harlem Shake craze has prompted a series of internet videos showing groups of people dancing to the song of the same name, by American DJ and producer Baauer.