Shocked passengers tweeted about the argument that grew so heated that the two crew members had to be removed from yesterday's flight.
Dan Lobb, a television presenter on the flight, described the scene as "unreal."
He tweeted: "This is quite incredible. We've all worked with people we don't get on with right? But this tiff means a 1 hr flight is delayed!"
The low-cost carrier confirmed what it called a "verbal disagreement" and apologized to passengers for the inconvenience.