Does it say the type of test required? Like can it be an at home test? Update from the news: the one case of omicron found in chicago was from a woman who was fully vaccinated and had her booster as well. Given to her by an out of state visitor.We just looked it up because of trying to see my son's fiance. The latest change was Dec 6 changing arriving international flights to needed a negative test within 1 day of the flight except the countries with bans. This is a change from needing a negative test within 72 hours of flight. This is for unvaccinated US citizens only. Non US citizens are required to be fully vaccinated to fly into the US.
Rules for departing flights depend on the destination country.