Olympic gold medalist Mo Farah was embarrassed and sent to the back of the queue by an airline attendant before a flight in the United States, his wife has said.
Mo Farah’s wife Tania Farah said the Delta Airlines official shouted at him and refused to believe he had a business class ticket.
According to U.K media outlet, BBC, a Delta Airlines spokesman said it was investigating and "will be working directly with the Farah family".
Farah and his family were flying from Atlanta to their home in Portland, Oregon.
"This woman basically humiliated him until people came forward and said: 'That's Mo Farah, the Olympic champion'," his wife said.
The incident is said to have happened on 22 August.