One of the biggest unanswered questions is why the U.S. ban covers several countries that the U.K. ban doesn't. Four countries included in the U.S. list -- the United Arab Emirates, Qatar, Kuwait and Morocco -- are absent from the U.K. restrictions. The difference is "a mystery," said Tim Clark, the president of Emirates Airline, who adds that its security practices have generally received high marks from other countries. A flyer, for example, can depart Houston (a popular Emirates destination for oil executives) for Dubai, laptop in hand. The ME3 carriers have exploited their position at the crossroads of Europe, Africa and Asia to act as a single stop between almost any two major points on the planet.

Source: CNN March 25, 2017 13:41 UTC