U.S. travel restrictions

Update. If you’re flying to the USA you must provide evidence of a negative COVID-19 test within three days of your departure, or proof that you have recovered from COVID-19. This applies to all passengers aged two years and older, U.S. citizens and legal permanent residents.
The US has suspended entry, or transit, of foreigners who have travelled to or reside in certain COVID-19 affected countries. They may also deny boarding of any US-bound traveller showing signs of illness.  Information and advice is available from the Centers for Disease Control and Prevention (CDC) and the Transportation Security Administration (TSA).
If you’re flying to the US from overseas you’ll be required to test negative to COVID-19 no more than three days before their flight departs or provide proof that they have previously recovered from COVID-19. Passengers will need to provide proof of the negative result or documentation of having recovered from COVID-19 to their airline before boarding. If a passenger does not provide documentation of a negative test or recovery, or chooses not to take a test, the airline must deny boarding. Further information is available on the CDC website.
In addition to being tested within three days of boarding their flight to the US, the CDC recommends that anyone travelling to the US from overseas get tested again within 3-5 days after arrival and stay home for seven days post-travel. US states have their own quarantine requirements for new arrivals from overseas and/or for domestic travel from other US states. Further information can be found on the websites of the individual states.
Many airports in the USA have implemented safety measures designed to limit the spread of COVID-19. You should check the website of the airport you are flying into or transiting to see how these could affect you.