The Canadian Lung Association reveals that Air Canada and WestJet have been urged to prohibit pets from aircraft cabins, after a ruling Thursday.

The airlines are not forced to change their policy from the Canadian Transportation Agency's decision. But, it is better to think over it.

The transportation agency declaration comes after a modification in policy of Air Canada in June 2009. It stated that a limited number of pets could be in the passenger cabin. WestJet also permit small pets.

Three passengers with cat allergies complained to the agency.

Cameron Bishop, the lung association spokesman, said, that the association wants the Transport Minister to modify the Canadian Transportation Act to prohibit pets outright, excluding animals like guide dogs for the blind.