I believe the most critical precaution one can take is to pre-board the aircraft in order to be able to thoroughly clean the area from the last occupant. This becomes even more important if the airline you have chosen serves your allergen. Children are especially likely to put their hands in their mouths. Those of us without food allergies worry about the germ factor on planes, but for a food allergic person, what was eaten before we boarded is potentially lethal if we touch it and then ingest it.
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