From the article:
The CTA ruling only applies to Air Canada but an agency spokesperson said other airlines typically follow suit.
Why the heck would the ruling not apply to WS and the charters? I have sympathy for allergic people and routinely travel with a friend with a severe peanut allergy, but there are no adverse issues if I eat them in the next seat. I wonder if people who suffer via miniscule airborne traces in an environment as well ventilated as an airplane cabin should perhaps not fly.