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According to the CDC, air passengers entering the U.S. will be required to present documentation of a negative COVID-19 viral test (called a Qualifying Test) conducted within the 3 days before their flight to the U.S. departs.
 

-Documentation should be for a viral test as approved or authorized by the relevant national authority.

-Test results must state: Negative, SARS-CoV2 RNA Not Detected, SARS-CoV-2 Antigen Not Detected, or COVID-19 Not Detected.

-Documentation may be paper or electronic copy and must include the name and contact information for the laboratory or healthcare personnel who performed the test.

-Test results may be required to be shown again upon landing.
 

Alternatively, passengers may provide documentation of having recovered from COVID-19 with documentation of test results conducted during the three months preceding the flight’s departure from a foreign country.
 

-Test results must state: Positive, SARS-CoV2 RNA Detected, SARS-CoV-2 Antigen Detected, or COVID-19 Detected. Invalid will not be accepted.

-Additionally, a letter from a licensed health professional stating that the passenger has been cleared for travel (called Documentation of Recovery).