Delta is getting serious about passengers wearing masks on flights.
As of July 20, 2020, “customers who indicate they have an underlying condition that prevents them from wearing a mask are required to complete a "Clearance-To-Fly" process before being permitted to travel, for everyone's safety,” Delta states on their website. Delta is taking this step so seriously that they recently turned a flight around because two passengers refused to wear their masks onboard.
Delta describes the Clearance-to-Fly process as a “virtual consultation process facilitated by a Delta agent with a third-party medical professional could take up to an hour, so customers needing a rare exemption should plan to show up to the airport early. Delta is encouraging customers prevented from wearing a mask due to a health condition to reconsider travel, altogether.” The Clearance-to-Fly process is required for each trip taken by a customer who needs it.
Delta began requiring face masks or coverings to be worn by their staff and customers back in early May, and provided face masks to customers who did not have one. They also implemented a back-to-front boarding process to encourage social distancing and less contact between passengers and is reducing the total number of passengers in each cabin and blocking middle seats until at least September 30, 2020.