Thanks to Transport Canada, I will soon feel more comfortable about taking Ella on a plane!
According to
this article in the Globe and Mail, the Canadian Transport Agency has ruled that individuals with a peanut/nut allergy should be considered "disabled" and therefore special accommodations must made to address their needs. Basically this means that a peanut/nut-free buffer zone has to be established on the airplane. The ruling only applies to Air Canada, but other airlines usually follow suit in similar situations.
Ideally, I would love peanut-free fights, but this "buffer zone" idea is at least a step in the right direction.