Yes, you can fly with a nut allergy, regarding you have your doctor's permission that it will be safe to take a flight with your nut allergy. Your doctor will be able to assess the severity of your allergy, and the risk that you may be exposed to.
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Some have only adrenaline ampoules, some have adrenaline ampoules and autoinjectors and some have none. If adrenaline is available in the form an ampoule, a needle and syringe are required and flight crew rely on a doctor or nurse being on the flight (as passengers) to have it administered in an emergency.
With a severe enough allergy, inhaling peanut dust can trigger a life-threatening emergency. In a confined space, any number of events could cause an issue: people dumping peanuts into their hands, dusting their hands off, accidentally sneezing while chewing the peanuts, etc.
This is not the first severe food allergy reaction to take place during a flight. Since 2003, the FAA has required all airlines to carry epinephrine in their onboard medical kits.
The problem with peanuts and tree nuts is that they are dry and flaky so can readily become airborne. Their oils are sticky and stubborn so can endure through a vigorous scrub with soap and water.
Customers with nut allergies are asked to inform cabin crew when boarding the flight and a public address is then made informing other customers and advising that no products containing nuts will be sold onboard.
Keep your epinephrine with you. Do not put it in your checked luggage or store it in the overhead bin. Let your traveling companions know about your allergies. Make sure they know what to do in case of an emergency on the flight and where your auto-injector is.
This is not the first severe food allergy reaction to take place during a flight. Since 2003, the FAA has required all airlines to carry epinephrine in their onboard medical kits.