CHANTILLY, Va. (AP) _ Customs and health officials at Dulles International Airport are scheduled to begin screening arriving travelers from three West African countries. Dulles is one of four U.S. Airports scheduled to begin the screening process Thursday, along with airports in Chicago, Atlanta, and Newark, New Jersey. Officials at the Metropolitan Washington Airports Authority, which runs Dulles, estimate that anywhere from 15 to 55 travelers arrive at Dulles every day from the three affected countries — Liberia, Sierra Leone and Guinea. The only direct service from West Africa to Dulles is a South African Airways flight that originates in Johannesburg and stops in Dakar, Senegal, before arriving at Dulles. Screeners will use no-touch thermometers to try to find passengers with fevers, the first symptom shown by Ebola patients.