(DUBAI, United Arab Emirates) — New security screenings for all passengers on U.S.-bound flights began on Thursday, with airlines worldwide questioning flyers about their trip and their luggage in the latest Trump administration decision affecting global travel.

However, confusion still remains about the new regulations, which come at the end of a 120-day period following the United States lifting a ban on laptops in airplane cabins affecting 10 Mideast cities. The new regulations cover all the 2,100 flights from around the world entering the U.S. on any given day.

Some airlines said they had received permission to delay implementing the new rules until January.

At Dubai International Airport, the world’s busiest for international travel, long-haul carrier Emirates began questioning passengers about their luggage, liquids they were carrying and where they were coming from. Passengers also had to have their carry-on bags searched, along with their electronics.

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