President Trump, speaking from the Oval Office, announced that the U.S. would suspend travel from Europe for 30 days effective Friday. Right now there are more questions about that than answers, since all that has actually been released on paper is a ban on non-U.S. residents entering the country who have been in Schengen Area countries within the last 14 days.
It’s not clear what the details of a broader ban will actually mean yet. Presumably the two policies will work in tandem, making it harder for Europeans to enter the U.S. while also requiring U.S. citizens currently in Europe to connect through the U.K., non-Schengen European countries, Canada or elsewhere on the way home.
At this point I wouldn’t discount the possibility that the President’s announcement to ban flights from Europe is inaccurate, and the actual policy adopted was to limit entry by people that have been to Europe. However even if that’s accurate it’s also possible that a ban on European flights will be signed, to sync up with what was announced on television.