As of January 24, 2023, are there any COVID-19 testing requirements for US citizens flying back to the US from abroad? The CDC page on the topic is very confusing with lots of clauses for travel from certain places (China) and non-US citizens, and doesn't state clearly whether US citizens not affected by those clauses need test results to board.
Aside from just a yes/no answer, I'd like a link to an official source or reputable third party stating it clearly.