https://travel.state.gov/content/travel/en/traveladvisories/ea/covid-19-information.html
Effective January 26, the Centers of Disease Control and Prevention (CDC) will require all air passengers entering the United States (including U.S. citizens and Legal Permanent Residents) to present a negative COVID-19 test, taken within three calendar days of departure or proof of recovery from the virus within the last 90 days. Airlines must confirm the negative test result or proof of recovery for all passengers two years of age and over prior to boarding. Airlines must deny boarding of passengers who do not provide documentation of a negative test or recovery.
REFERENCE:
CDC- TRAVEL.STATE.GOV
