American social media celebrity says he was removed from a New York-bound plane in London after speaking Arabic on the aircraft.
Adam Saleh posted video of the incident on Wednesday to his Twitter feed.
"Delta airlines kicked us out for speaking Arabic to my mom on a plane," Saleh tweeted.
By the time of publishing, a recorded clip he posted had been shared more than 300,000 times.
"We're getting kicked out because we spoke a different language," Adam Saleh says in the clip. "This is 2016. Delta airlines are kicking us out because we spoke a different language."
Addressing one his fellow passengers, he can seen saying: "I spoke a word [of Arabic], and you said you feel uncomfortable?" Saleh had been due to fly from London to New York with his friend Slim Albaher, who was also removed.
Saleh said that they were later placed on another flight, having been re-checked by security.
Saleh is a YouTube star, with more than 1.5 million subscribers. Many of his videos feature him carrying out practical jokes. A statement from Delta Air Lines, posted to its website, read: "Two customers were removed from this flight and later rebooked after a disturbance in the cabin resulted in more than 20 customers expressing their discomfort."
The airline has launched a review "to understand what happened".
"We are taking allegations of discrimination very seriously; our culture requires treating others with respect," the statement continued.
In a final message before taking off, Saleh told his 257,000 Twitter followers that he would be visiting his lawyer when he arrives in New York, apparently over the incident that had just taken place.
Several people have been removed from planes over the past two years.