From Delta Air Lines:
Delta Air Lines’ first priority is the safety of our customers and our employees. We’ve expanded our cleaning processes to include a fogging procedure that disinfects surface areas that we all touch in the aircraft.
The procedure uses a safe, high-grade EPA-registered disinfectant that is highly effective against many communicable diseases, including coronaviruses. Following the fogging procedure, cleaning crews thoroughly clean cabin surfaces including tray tables, seatback screens, and lavatories.