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Most credit cards you read on blogs are ONLY for USA people.
From a Central European viewpoint, I can confirm that the Citi Premier Miles card is accessible in Poland, allows you to swap points or miles for plane tickets.
In the Nordic countries, consider looking into the Norwegian bank card or the SAS EuroBonus cards, which are linked to Norwegian Air and SAS loyalty programs, respectively.
Additionally, I recommend checking out the Miles & More website’s credit card section to see which cards are available by country.
This Star Alliance airlines program is quite beneficial, with monthly mile deals.
Hope that helps!