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FILE – In this May 14, 2021, file photo, passengers from Hanover wait to pick their luggage at Nikos Kazantzakis International Airport in Heraklion, on the island of Crete, Greece. Coronavirus infections, hospitalizations and deaths are plummeting across much of Europe. Vaccination rates are accelerating, and with them, the promise of summer vacations. (AP Photo/Harry Nakos, File)