Air travel seems to get harder all the time. The latest threat to the traveling public comes in the form of four legs and fur. According to an editorial published this week in the Canadian Medical Assocation Journal, it's time for humans with pet allergies to take back the skies. So many people today are flying with small pets in the airline cabins that people with pet allergies are being put at risk, state the authors of the paper, who represent the journal and the University of Ottawa. About one person in 10 has an allergy to animals.