Staff at Cathay Pacific Airways , Hong Kong’s flagship airline, are on edge. Since an Aug.9 directive by the Civil Aviation Authority of China (CAAC) that called for the suspension of staff who supported or participated in the demonstrations, the regulator has rejected some entire crew lists without explanation, two sources with knowledge of the matter told Reuters. The rejections have forced Cathay to scramble, pulling pilots and flight attendants off standby while it investigates social media accounts in an effort to determine which crew member has been deemed a security threat, one of the sources said.