Just as summer travel kicks off and the United States lifts its coronavirus testing requirement for arriving international passengers, many European airports are suffering major disruption.

The U.S. hit a new milestone for airport passenger screening this week, with the TSA reporting that it screened more people Thursday than it did on the same date in 2019.

Portugal and Spain imposed new restrictions on U.K. visitors amid concern about the coronavirus delta variant as Germany pushed for a more coordinated European Union response to try to limit the strain taking hold in the bloc.

Passengers aboard an American Airlines flight from New Orleans to Dallas earlier this month had no idea what they were about to witness. A veteran in need. Another ready to help.

EU health officials predicted Wednesday that the delta variant will make up 90% of all cases across the bloc by the end of August.

Vaccinated Defense Department personnel and other Americans living in Germany can obtain free digital coronavirus vaccination certificates and use them to travel in the European Union, where new cases are falling and many countries are reopening for visitors.

As restrictions on nonessential travel across the U.S.-Canada land border enter their 16th month this week, pressure is rising on both sides for Prime Minister Justin Trudeau and President Joe Biden to crack it open — even a little — or to provide something, anything, about what a reopening plan might look like.

Travelers from the U.S. or any of the other seven countries, regions and territories allowed into Germany again must have been fully vaccinated against the coronavirus at least 14 days before arrival, Interior Ministry spokeswoman Alina Vick told Stars and Stripes.

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All 27 EU member states will accept, “unconditionally,” all those who are vaccinated with inoculations approved by the European Medicine Agency.