Disability campaigners are calling on airlines to make policy changes to allow all assistance and guide dogs to travel on board aircraft. Most airlines do not allow owner-trained assistance dogs on board and require proof that the animal has been trained by a charity affiliated to specific organisations. The airlines say they can only accept affiliated dogs due to safety, however the campaigners claim proof of disability and a letter from a recognised professional who has witnessed the dogs in action should suffice. Charity Assistance Dogs Council, which represents the interests of owner-trained animals, also claims the waiting times for a trained dog affiliated to the groups recognised by the airlines can be between two and five years and some do not cater for certain types of disabilities.