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.

(Chris Rank for Rank Studios)

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.

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