In this March 30, 2021, file photo, German federal police officers check passengers arriving from Palma de Mallorca for a negative coronavirus test as they arrive at the airport in Frankfurt, Germany. The European Commission proposed Thursday, April 29, 2021, issuing Digital Green Certificates to EU residents to facilitate travel across the 27-nation bloc by the summer 2021, as long as they have been vaccinated, tested negative for COVID-19 or recovered from the disease. (AP Photo/Michael Probst, File)
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