OTTAWA - The Asthma Society of Canada is welcoming a tribunal's ruling that will require Air Canada and WestJet to restrict cats in their passenger cabins.

The Canadian Transportation Agency has ruled the two airlines must protect passengers who are allergic to cats.

It's suggesting either a ban on cats aboard flights carrying allergic passengers, or cat-free buffer zones and effective ventilation.

Society president Robert Oliphant calls it a victory for allergy and asthma sufferers.

The ruling follows complaints from three allergic passengers.

Both airlines now allow small pets to travel in the cabin on many flights, although not on some international routes.

The airlines are required to advise the agency within 30 days whether or not they intend to implement one of two proposed solutions.

They say they're studying the ruling.