The boss of American airline Delta has said that over "100 people" have been have been blacklisted by the company over their refusal to wear face masks.
During an appearance on the Today Show, CEO Ed Bastian recently told passengers "If you insist on not wearing your mask, we will insist that you don't fly Delta."
Face coverings have been mandatory on Delta flights since the 1st of May. The company introduced the measure along with a decision to stop selling the middle seats as an effort to increase social distancing between passengers.
Domestic passengers are only permitted to fly without a face covering if they have a valid medical reason. This involves filling in a "Clearance-To-Fly" exemption when they arrive at the airport.
The airline's website advises those seeking exemption to arrive early, warning travellers that the screening "can take over one hour".