The airline, however, is painting a different picture.
The Delta crew had noticed the couple sweating and saying the word "Allah". A Delta employee asked the couple to exit the aircraft as he needed to ask them questions on the Paris to Cincinnati flight.
Faisal Ali and Nazia Ali were asked if, "...we should get our stuff and he said, 'Yes, take all of your stuff as you won't be on that flight'," Ms. Ali told The Independent. "That was really alarming."
The couple was interrogated again by a US customs agent at the airport the next day. But it was decided that the couple posed no threat.
Delta Air Lines spokesman Morgan Durrant responded: “Delta condemns discrimination toward our customers in regards to age, race, nationality, religion, sexual orientation or gender. As a global airline that brings hundreds of thousands of people together every day, Delta is deeply committed to treating all of our customers with respect. Delta continues its investigation into this matter and will issue a full refund of these customers’ airfare.”