The US and UK are banning laptops from cabin baggage on flights from certain countries in the Middle East and North Africa, as well as Turkey.
The US ban on electronic devices larger than a smartphone is being imposed as an anti-terrorist precaution.
It covers inbound flights on nine airlines operating out of 10 airports. Phones are not affected.
The British ban, announced hours after the American measure, is similar but applies to different airlines.
Downing Street said airline passengers on 14 carriers would not be able to carry laptops in cabin luggage on inbound direct flights from Turkey, Lebanon, Jordan, Egypt, Tunisia and Saudi Arabia.
The Turkish government said the US ban was wrong and should be reversed.
Large electronic devices will still be allowed on board in checked baggage.
Which flights are affected?
The nine airlines affected by the US ban are Royal Jordanian, EgyptAir, Turkish Airlines, Saudi Arabian Airlines, Kuwait Airways, Royal Air Maroc, Qatar Airways, Emirates and Etihad Airways.
They have been given 96 hours, ending at 07:00 GMT on Saturday, to ban devices bigger than a mobile phone or smartphone from cabins, US officials said, adding that the ban had no end date.
The airports affected are:
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Mohammed V International, Casablanca, Morocco
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Ataturk Airport, Istanbul, Turkey
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Cairo International Airport, Egypt
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Queen Alia International, Amman, Jordan
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King Abdulaziz International, Jeddah, Saudi Arabia
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King Khalid International, Riyadh, Saudi Arabia
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Kuwait International Airport
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Hamad International, Doha, Qatar
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Abu Dhabi International, United Arab Emirates
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Dubai International, United Arab Emirates


