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Do I need a PCR test before boarding the flight?
PCR test requirements are determined by the official authorities of the countries of origin and destination. For information about passport, visa and health requirements of the country of destination, please visit IATA's passport, health and visa requirements page. You can get detailed information from the Travel Restrictions Applied by Countries page for country-specific restrictions and other applications.
Is a PCR test required for transit flights?
Transit passengers arriving to Turkey from abroad are not required to submit a PCR test in Turkey however they are advised to review the flight restrictions applied by the destination country.
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Wenn das zu ungenau ist, dann solltest Du bei Turkish Airlines nachfragen.