Can the FAA/IASA protect us?
https://www.faa.gov/travelers/international_travel/
"FAA conducts the
International Aviation Safety Assessment Program (IASA), assessing the Civil Aviation Authority (CAA) of each country that has carriers operating to the United States [...]"
I am not sure if any Czech airline is currently operating to the US ... but currenly the Czech CAA has a Category 1 rating. So all is good!