There is no evidence to show that peanut or tree nut residue circulates in the air, as opposed to it quickly settling on surfaces. The widespread and often repeated belief about dangerous particles becoming airborne from opened nut packets (known as aerosolization) is a myth.

The restriction on nuts—specifically peanuts—on many flights in 2026 is a critical safety measure to protect passengers with severe, life-threatening allergies. In a pressurized, recirculated cabin, airborne particles from nuts being opened or consumed can circulate through the ventilation system, potentially triggering anaphylaxis in sensitive individuals. Anaphylactic shock is a medical emergency that is extremely difficult to manage at 35,000 feet with limited medical kits. While recent studies suggest the risk of true "airborne" reactions is lower than previously thought, the risk of surface contamination (on tray tables, armrests, and headrests) remains very high. Many airlines, such as EasyJet and Turkish Airlines, have removed peanuts from their in-flight menus entirely. If a passenger notifies the crew of a severe allergy, the airline will typically create a "buffer zone" and ask nearby passengers to refrain from eating their own nut products, ensuring a safe and inclusive environment for all travelers.