In summary: Helps wash away airborne pathogens, dust and other pollutants, helps unblock your ears, helps keep nasal passages moisturized & helps you arrive as healthy as you departed!. Ideally use FESS Frequent Flyer Nasal Spray before boarding the plane and every two hours during the flight. It's also a good idea to continue using the FESS Frequent Flyer Nasal Spray after landing to help fight potential infection and because FESS Frequent Flyer is non habit forming you can use it more often or as necessary. This spray also helps to clear blocked ears and provide temporary relief from sinusitis, the FESS Frequent Flyer Nasal Spray contains gentle ingredients that do not cause rebound congestion.