There's already a thread running on this subject in Jet Blast...
https://www.pprune.org/jet-blast/608...-emirates.html
Maybe the mods will merge/tidy up. In the meantime to paraphrase what I have just posted there, FWIW BA's policy is detailed here:
https://www.britishairways.com/en-gb...-and-pregnancy
IMHO and obviously in the considered opinion of others nobody can guarantee a nut free enviroment/nut product free surfaces on any aircraft, especially with the increased incidence of passengers self catering to a greater or lesser degree....