A British Airways flight from London to Newark was the subject of a security alert which has since been lifted.
Two unspecified threats made by a male caller proved unfounded, according to US media reports.
Passengers were evacuated from the plane and luggage removed. Police at the airport later said nothing harmful was found on board.
The aircraft, carrying 206 passengers and 13 crew, landed at Newark Liberty international airport at around 1pm local time on Thursday.
Customs officials continued checking the luggage but the aircraft was given the all-clear.
A spokesman for the Port Authority of New York and New Jersey said it had released the aircraft to BA.
The Port Authority received the threat about the flight at around 10am when the aircraft was already in the air.
ABC television reported that the two separate threats now appear to have come from the same person.
No arrests were reported to have been made and the investigation was ongoing, the BBC reported.
A BA spokesman said that the aircraft landed normally and security checks were carried out as a precaution.
"We do not discuss details of operational security. The safety and security of our customers and crew is our number one priority."
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