Runner Mo Farah with wife Tania and daughter Rhianna, who holds his new gold medal. The wife of four-time Olympic champion Mo Farah today reveals his “humiliation” at being forced to go to the back of the queue for a business class flight.Tania Farah says her husband, 33, was singled-out by a flight attendant who refused to recognise that he had a business class ticket for the journey back from Rio.Witnesses later claimed Mrs Farah swore at the airline worker, called her “pathetic” and told her she led a “sad little life”, and was being “disrespectful”, before demanding an apology. The alleged incident on August 22, as the couple and their four children waited to board a 9.35am connecting flight from Atlanta, Georgia to their home in Portland, Oregon.Speaking exclusively to the Sunday Telegraph, she said: “This woman basically humiliated him until people came forward and said: ‘That’s Mo Farah, the Olympic champion…’ She was mortified afterwards, but had basically yelled at him like he was a piece of s— to get back into line.“He was the only black person [in the queue] and hadn’t done anything to warrant it. I just knew she had a problem with him.”Mr Farah was carrying a Team GB holdall, witnesses said, while his stepdaughter, Rhianna, 11, clutched a Pride the Lion Team GB mascot. But despite Mo’s huge success – which has led to calls for him to be granted a knighthood – she revealed she is still nervous of discussing her religious faith for fear of how others might perceive her.“Religion is important to us despite how it might look, ” she explained. “We don’t pray five times a day, but we certainly follow the main fundamentals of the religion, especially for our kids.“I’m sometimes a bit wary of telling people I’m a Muslim because I’m worried of how they might view me. It sounds terrible because I should be proud and I am, but I’m also conscious of how we’re viewed nowadays.”She added: “The more people can give a positive image for Islam the better because we so need it and we’re all about peace.”Mo and Tania Farah will compete in the Great North Run on Sunday in Newcastle. Want the best of The Telegraph direct to your email and WhatsApp? Sign up to our free twice-daily Front Page newsletter and new audio briefings. Tania Farah embraces her husband Mo after he won the Men’s 5000 metre final on August 20, 2016Credit:Patrick Smith/Getty Images Tania and Mo Farah arrive for GQ Men Of The Year Awards 2016 at Tate Modern, London, on September 6, 2016Credit:Gareth Cattermole/Getty Images It is understood the family were finally allowed onto the aeroplane when a second official intervened. Once aboard, they were applauded by passengers.A Delta Airlines spokesman said: “We are investigating this situation and will be working directly with the Farah family.”He added that the company “takes precautions to protect customer data and information”.In her candid interview with The Sunday Telegraph, Mrs Farah also describes how the pair fell in love after bonding over their shared religion of Islam while attending a school in a predominantly white area of London.She expresses her hopes that the family will one day be able to visit the Saudi Arabian city of Mecca, considered holy in Islam.