US authorities have told Reuters they were planning the ban in response to an unspecified terrorism threat.
The new rule was expected to be announced as early as today by the Department of Homeland Security, the officials said, adding that it had been under consideration since the US government learned of a threat several weeks ago.
The source said the rule would cover a dozen foreign airlines flying from about a dozen countries, including some from the Middle East, and would include airlines based in Jordan and Saudi Arabia.
