The document discusses several publications that provide information relevant for the travel industry: OAG (Official Airlines Guide), PAT (Passenger Air Tariff), and TIM (Travel Information Manual). OAG publishes monthly and provides up-to-date flight schedules for 95% of worldwide flights. PAT publishes quarterly and provides up-to-date airfares for 90-95% of worldwide flights. TIM publishes monthly and provides country information and data from airlines and WHO for 95% of the world's countries. These publications are reliable sources of travel information despite not always reflecting the most recent changes, as they receive data directly from airlines.