The CDC has recently put forward new guidance on traveling in to and within the US. The central feature of the new guidance is "If you plan to travel internationally, you will need to get tested no more than 3 days before you travel by air into the United States (US) and show your negative result to the airline before you board your flight, or be prepared to show documentation of recovery (proof of a recent positive viral test and a letter from your healthcare provider or a public health official stating that you were cleared to travel)."
Please use the Links Below for greater information:
https://www.cdc.gov/coronavirus/2019-ncov/travelers/testing-international-air-travelers.html
https://www.cdc.gov/coronavirus/2019-ncov/travelers/travel-during-covid19.html