Vaccine card quickly looked at before departing Istanbul, but after receiving boarding pass. Had to fill out a PLF on line before departure. Upon arrival no one asked to see it. Had to complete another on the plane, no one asked to see it. Had my vaccine card, no one asked to see it. All I can guess is it all pops up when they scan the passport
Welcome to Zagreb, Croatia!!!
Country 1 - Ukraine
https://community.ricksteves.com/travel-forum/general-europe/country-one-entering-ukraine
Country 2 - Turkey
https://community.ricksteves.com/travel-forum/general-europe/country-two-turkey
Country 3 - Croatia
https://community.ricksteves.com/travel-forum/general-europe/country-three-croatia
Country 4 - Bosnia & Herzegovina
https://community.ricksteves.com/travel-forum/general-europe/country-four-bosnia-herzegovina
Country 5 - Montenegro
https://community.ricksteves.com/travel-forum/general-europe/country-four-montenegro