US tightens restrictions on air travel from Ebola zone

The Department of Homeland Security ordered passengers whose journeys begin in Guinea, Liberia or Sierra Leone to fly to New York's JFK or Newark airports, Washington Dulles, Atlanta or Chicago. The new measures go into effect on Wednesday.

There are no direct scheduled flights to the United States from the three countries at the heart of the Ebola epidemic, but travellers from the region can transfer through African and European hubs.

One Liberian with Ebola arrived in Dallas, Texas and infected at least two US health workers before dying earlier this month, piling pressure on President Barack Obama's government to impose a flight ban.

Health authorities have set up additional screening at five ports of entry, airports which they say normally handle 94 per cent of the travelers arriving from the three worst-hit countries.

But Tuesday's order would prevent travellers from Guinea, Liberia or Sierra Leone from transferring to flights to other US airports where they would not necessarily have to pass additional screening.

"If not already handled by the airlines, the few impacted travelers should contact the airlines for rebooking, as needed," Homeland Security Secretary Jeh Johnson said. "We currently have in place measures to identify and screen anyone at all land, sea and air ports of entry into the United States who we have reason to believe has been present in Liberia, Sierra Leone or Guinea in the preceding 21 days."