Emirates and Turkish Airways said Wednesday they have been exempted from a U.S. ban on laptops in airplane cabins, joining Etihad in satisfying American security concerns that had cut into the long-haul carriers’ business.

It remains unclear how the airlines addressed fears that the Islamic State or other groups might smuggle explosives on board in electronic devices. But in Turkey, authorities now use CT scanners to take cross-section images of passengers’ electronics just before they board airplanes heading to the U.S.

The Department of Homeland Security, which oversees airplane safety in the United States, did not immediately respond to a request for comment early Wednesday.

Emirates’ hub at Dubai International Airport has grown into the world’s busiest for international traffic, in large part thanks to Emirates’ expansion. It was one of 10 airports affected by the ban on cabin electronics put in place by the Trump administration in March.

On Wednesday, Emirates said in a statement that it had worked to “implement heightened security measures and protocols” to satisfy American requirements. It did not elaborate, following a similar precedent set by Abu Dhabi-based Etihad, which American officials cleared on Sunday.

“We would like to express our gratitude to the U.S. and local authorities for their support and thank our customers for their understanding and patience during the last few months when the ban was in place,” Emirates said.

In Istanbul, Turkish Airlines tweeted that passengers aboard its U.S.-bound flights should “fasten your seatbelts and enjoy your own electronic devices.” A statement from the airline said it had taken over 81,000 electronic devices away from passengers to store them in specially protected baggage during the 102 days the ban was in place.

The U.S. laptop ban, first announced in March as a security measure, now applies to nonstop U.S.-bound flights from seven international airports in Amman, Jordan; Kuwait City; Cairo; Jeddah and Riyadh, Saudi Arabia; Casablanca, Morocco; and Doha, Qatar.

In May, U.S. President Donald Trump shared highly classified intelligence with senior Russian officials visiting the White House about the Islamic State group wanting to use laptops to target aircraft.

Qatar Airways, the last of the three major Gulf long-haul carriers on the list, declined to answer questions Wednesday about the ban. That airline already has been blocked from much of its neighbors’ airspace over an ongoing dispute with four Arab nations.

Saudi Arabian Airlines has said it hopes to be off the ban list “on or before July 19.”

There is a precedent for concern over laptops being used as bombs. Somalia’s al-Qaida-linked al-Shabab said it planted a bomb inside a laptop-like device that exploded on a plane leaving Mogadishu in February 2016, killing only the bomber.

However, the security concerns also come amid a wider dispute between Gulf airlines and American carriers, which accuse the Middle East airlines of flooding the market with flights while receiving billions of dollars of unfair government subsidies. The Gulf carriers all vigorously deny that.

The laptop ban, coupled with the Trump administration’s travel ban on six predominantly Muslim countries, has hurt Middle Eastern airlines. Emirates, the region’s biggest, said it slashed 20 percent of its flights to America in the wake of the restrictions. The airline said Wednesday it now flies 103 flights a week to the U.S.

(AP)