Source: The Straits Times

There are very diverse views on this. Someone mentioned a point that what if the person brings nuts to the cabin for his personal enjoyment during the flight?

Extract of report:

Singapore Airlines (SIA) said it is reviewing the serving of nuts on board its flights, following an incident last week when a toddler had an allergic reaction to peanuts eaten by other passengers.

The three-year-old boy, Marcus, was with his parents Chris and Hong Daley on SQ217 from Singapore to Melbourne last Wednesday (July 12) when the incident occurred.

The Daleys, who are from Australia, have reportedly lodged a formal complaint with the airline.