BEIRUT - Airlines operating at Beirut's Rafic Hariri International Airport have begun implementing measures in compliance with US President Donald Trump's travel ban on refugees and nationals of seven Muslim-majority countries, airport sources said on Sunday. The measures would include denying US-bound travel for nationals from those countries - Syria, Iraq, Iran, Somalia, Sudan, Libya and Yemen - who were not US green card holders, the sources said. US-bound journeys from Beirut typically involve transfers in Europe, Turkey or Gulf Arab countries.