dubai etihad airways advise passengers check u.s. diplomatic missions travel u.s. president donald trump sign revise executive order ban visit nationals six muslim-majority nations monday order take effect march 16 keep 90-day ban travel u.s. citizens iran libya syria somalia sudan yemen apply new visa applicants mean 60,000 people whose visa revoke previous order permit enter etihad base unite arab emirates say strongly encourage nationals list countries consult near unite state embassy consulate ensure legally entitle enter unite state fellow uae carrier emirates say aware new order would adhere it emirates comply guidance provide us u.s. customs border protection airline spokeswoman say email carrier force reschedule flight crew u.s. flight comply original ban trump original jan. 27 executive order suspend feb. cause chaos confusion airports worldwide airline industry complain lack clear direct communication u.s. officials hours monday order sign qatar airways spokeswoman tell reuters receive guidance u.s. government new ban etihad advise check u.s. missions new trump order