BoeingPremarket trading on Friday saw travel stocks slide after several European countries and Asian countries issued new restrictions regarding travel from south Africa. This was due to a Covid variant.

Thursday’s announcement by the U.K. that flights would be temporarily suspended from South Africa and Namibia, Lesotho (Eswatini), Zimbabwe, and Botswana was made on Thursday. Travel between Europe and Southern Africa should not be stopped by the European Commission.

These new restrictions show how Covid-19 variants can disrupt travel. Boeing, along with many other aircraft makers and airlines were optimistic about the possibility of a rebound in consumer demand.

Boeing shares fell more than 6% during premarket trades, Delta Air LinesThis was down 7% United Airlines fell 8%. Hotel giant HiltonThe market opened at a nearly 5% discount.

On possible travel restrictions for the U.S., neither White House nor State Department immediately commented.

The Biden administration lifted the broad travel ban that had been in place since Nov. 8 for most people visiting more than 30 countries (including the U.K. and the EU), South Africa, Brazil, South Africa, South Africa, and Brazil.

The story is still in development. Stay tuned for new updates.