AVIATIONMideast carriers' passenger demand increases 2.8%Reuters Images/Denis BalibouseTrade tensions, protective tariffs and Brexit are all uncertainties that overhang the industryStaff Writer, Saudi Gazette{{day}} {{monthName}} {{year}} • {{hourTwoDigit}}:{{minuteTwoDigit}}QATARGCCUAESAUDI ARABIAMENAAVIATIONPHOTO