Royal Jordanian airlines "jumped the gun", one official said, with an advisory Monday to passengers.
The U.S. Transportation Security Administration has a lengthy list of things that are prohibited from being brought onto planes, but electronic devices are not on it.
The tweet, posted March 20, said that "US departments" had issued instructions that from March 21, passengers on Royal Jordanian flights to and from the U.S. would be "strictly prohibited" from taking onboard electronic devices.
The TSA bans spare or uninstalled lithium batteries from checked baggage, but not installed batteries, so passengers should be clear to check laptops and other electronic devices. The AP reported that the ban has been under consideration for weeks, and that Homeland Security Secretary John Kelly "phoned lawmakers over the weekend to brief them on aviation security issues that have prompted the impending electronics ban".
The ban does not apply to mobile phones or medical devices, but does include laptops, tablets, electronic games and cameras, according to reports.
At least 12 Middle Eastern and African airlines will be affected "new security procedures", reported CNN aviation correspondent Jon Ostrower, citing a USA official. Royal Jordanian's flights to Montreal, which now continues on to Detroit, would also be affected.
So far, only Royal Jordanian Airlines has tweeted about (and subsequently deleted its message).
In an emailed statement to Business Insider, the Department of Homeland Security wrote, "We have no comment on potential security precautions, but will provide an update when appropriate". None of the larger Middle Eastern airlines like Emirates have yet commented on this laptop ban. In February, after a federal court temporarily froze the travel ban he ordered, the airline turned the ban into fodder for a cheeky advertisement.