Not in the list of the best, doesn't mean that the airlines aren't 'good' or 'good enough' though. Does America need to be in the list of best things for everything?
It's just an airline. A lot of these airlines from other countries operate a lot of flights in the US, who cares about their country of origin?
What is a 'good' airline, and who gets to define the standard of 'good'?
A good method would be to ask some people. Skytrax ‘conducted more than 14 million customer surveys in more than 100 countries between September 2021 to August 2022 to find out the world’s current favorite airline.’