Delta Air Lines worker Chuck Gould uses an electrostatic sprayer to disinfect a Boeing 757-232 at Gate 71 of the Orlando International Airport.

The “electrostatic” treatment, along with high-volume, high-efficiency air filtration systems are used widely by airlines.

The worker’s backpack pump made a purring sound and its hose nozzle hissed as it ejected a liquid disinfectant formulated to be non-corrosive for aircraft and electrically charged to cling to whatever it touches.