23 November 2021 - Millennium Chelsea Harbour Hotel,
9 December 2021, Virtual
February 2022, Virtual
Passengers travelling to the US could have their electronic devices seized by airport security if the equipment does not turn on.
The move comes as part of a security clampdown at airports with direct flights to the US after American officials last week warned of a "credible" terrorist threat.
The increased checks are featuring at UK airports, including Heathrow.
The new restriction means that any electronic device that has a flat battery may not be allowed on to the flight.
A statement from the Transportation Security Administration (TSA) said: "During the security examination, officers may also ask that owners power-up some devices, including cell phones.
"Powerless devices will not be permitted on board the aircraft. The traveller may also undergo additional screening."