The Centers for Disease Control and Prevention (CDC) has issued an order requiring all passengers traveling to the United States from a foreign country to provide either a negative COVID-19 test result or documentation of recovery from the virus. This rule applies to passengers aged two and above and aims to prevent the spread of COVID-19 and its variants. Airlines must verify this information before boarding passengers, and failure to comply may result in penalties. The order takes effect on January 26, 2021, and will remain in place until further notice.
Simple Explanation
To keep everyone safe from COVID-19 when flying to the United States, all grown-ups and kids over two need to show a paper that says they don't have the virus or have gotten better from it recently. The airplane staff will check this before letting anyone on board.