KEY POINTS
  • Carriers around the world have already struggled as the spread of coronavirus saps demand.
  • US airline shares tumbled again after Trump's ban was greeted by shock and confusion.
  • The new rule will ban many foreigners who have been in Europe in the last two weeks from entering the U.S.
People walk through a sparse international departure terminal at John F. Kennedy Airport (JFK) as concern over the coronavirus grows on March 7, 2020 in New York City.

U.S. airline stocks plunged Thursday after President Donald Trump announced sweeping travel restrictions, including an unprecedented 30-day ban on foreigners arriving from most of Europe, a measure he said was necessary to stop new cases of coronavirus "from entering our shores."

Trump in a televised address called the new coronavirus "foreign" and attacked Europe for not taking the same actions to control the disease that he had.