PASSENGERS with food allergies are being urged to take precautions after experts warned a common mistake could be deadly.

Airlines cannot guarantee flights are free from allergens , leaving travelers at risk if they don’t take precautions.

Southwest Airlines says it cannot promise an allergen-free environment on planes or in terminals.

Peanuts are not served, but some snacks may contain traces or be packaged near peanuts.

Other passengers may bring peanut products onboard, and residues may linger on seats, tray tables, and floors.

Travelers with other food allergies are advised to check labels carefully and bring their own safe snacks.

United Airlines warns that its foods may contain milk, eggs, fish, shellfish, tree nuts, wheat, soy, and sesame.

Passengers with severe alle

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