Air travelers trying to take Samsung Note 7 smartphones on flights could now face stiff fines and will have the device confiscated.
New emergency rules came into force at the weekend completely banning the smartphones even if they have been shut off, the Federal Aviation Administration said.
The devices are not allowed aboard any passenger or cargo aircraft.
"We recognize that banning these phones from airlines will inconvenience some passengers, but the safety of all those aboard an aircraft must take priority," US transportation secretary Anthony Foxx said in a statement.
"We are taking this additional step because even one fire incident in flight poses a high risk of severe personal injury and puts many lives at risk."
The agency said anybody attempting to take a Note 7 on a flight would likely be ‘denied boarding.’
Samsung has already said it is halting all production of the tainted model, in a move that will cost it more than $5 billion.
There have been about 100 incidents of phone batteries catching fire or overheating with at least 13 people reporting burns.
